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Category: Value Chain Management
AccountancyValue Chain Management
Guidant Global announces new leadership line-up to drive further international expansion
Mohammed Junaid on 14th May 2019
Guidant Global, part of Impellam Group, is delighted to announce changes to its executive team as the global leader in talent acquisition and managed workforce solutions continues to make rapid progress in expanding and transforming its portfolio across international markets.
Former Senior Vice President of Global Solutions, Karen Gonzalez, is stepping into the newly created role of Chief Sales Officer where she will become immediately responsible for overseeing global sales across North America and in the UK.
For over 25 years, Gonzalez has dedicated her career to helping clients find better ways to manage their workforces. She was appointed to her former role, overseeing the company's sales organization, in 2015. In her first year she led the sales team to achieve more than $650 million in spend under management, a figure which has now risen to more than $1.5 billion.
Commenting on her expanded remit, Karen Gonzales, Chief Sales Officer at Guidant Global, said:
"I am delighted to be stepping into this new role which is firmly aligned with Guidant Global's long term objectives through enabling a more holistic approach to international sales strategy. I'm incredibly excited by what can be achieved, both in the short to medium term and as we continue to expand into new geographies."
Former President of the Americas, Brian Salkowski, meanwhile, has been elevated to Chief Operating Officer where he will lead the implementation of the brand's strategic vision and its operational delivery.
Dedicated to changing the dynamic of MSP services by championing a better, more forward-thinking approach, Salkowski has 20 years' experience in the workforce management industry and was a key figure behind the coming together of Bartech and Guidant Group, which marked the inception of Guidant Global in 2018.
Commenting on his new role, Brian Salkowski, Chief Operating Officer at Guidant Global, said:
"I am honored to step into this role at a time when the organization continues to grow its portfolio across international markets. The creation of Guidant Global enabled greater sharing of best practice, best people and operational accountability for the workforce solutions business and through the creation of a Chief Operating Officer role we are able to bring greater synergy across implementation, operations and account management."
Simon Blockley, CEO of Guidant Global, added:
"I'd like to congratulate both Karen and Brian on their new positions and I have no doubt that both will excel in their new roles. The alignment of our key teams is integral to success in expanding our global reach and this new leadership structure is indicative of our commitment to finding better ways of working in order to meet our organizational objectives."
TaxValue Chain Management
Allegro Named in '20 Most Promising' List
root on 1st April 2014
Allegro Development Corporation, a leading provider of commodity value chain and risk management (CVCRM) software, has been named by CIO Review Magazine as one of the top 20 Most Promising Risk Management Solution Providers for the Capital Market.
The magazine featured Allegro in its March edition citing its contributions to the commodity value chain, specifically the software's ability to help clients better monetize their assets, reduce risk and realize greater returns in a shorter span of time.
Allegro's Chief Executive Officer, Ray Hood said: "The uniqueness of this solution is that it allows customers to select only the components and functionalities they need, while simplifying deployment and enabling companies to quickly expand into new markets."
Allegro's flagship product, Allegro 8, has an enterprise-level risk management architecture that allows companies to manage operations and integrate new components as their needs change. The software is used by traders, risk managers, and decision-makers across the globe. The solution uses grid computing to manage numerically intensive processes such as real-time valuation and optimization and enables traders and marketers to view existing positions and to dynamically optimize them based upon real-time connectivity to more than 22 commodity exchanges as well as streaming pricing data.


If you can't see any shows here, check back soon or sign up to my mailing list.
I didn't realise, until I saw it all all written down, quite how many gigs I'd racked up, especially between 2008 and 2010 when I was in three bands simultaneously. Looking at it all now, I wonder how I ever found time to eat, let alone turn up for my day job, have a social life, or sustain a relationship. And God knows how I found any time to make any new music whilst all this was going on. But somehow, I always did. My record keeping was a little patchy at times, so I'm sure there's some I've forgotten - if anyone is interested enough to suggest any additions or corrections, I'm all ears. I'm pretty sure, though, that this section is of little interest to anyone other than me!


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Brit backpacking in South America dies from severe allergic reaction and family need help to bring her home
by Tracy L. Lawson | Jul 12, 2020 | Backpakers
A young British student has tragically died after suffering a severe allergic reaction while backpacking in South America.
Kishori Salter spent the final two weeks of her life in Colombia conquering "her fear of heights".
The 21-year-old globetrotter was due back at university next month but tragically died after suffering a lethal reaction.
Her family have launched a fundraising page to bring her body home as the student from London did not have travel insurance.
On the Gofundme page, her heartbroken sister Animka said: "Kishori was a 21 year old girl at the prime of her life.
"She has spent her past year all over the world, skiing in Grenoble and partying in Valencia.
"She was travelling in South America as a final hurrah on her year abroad before returning to University in Nottingham in September."
Kishori's family is appealing for help to bring her body home from South America
"She spent the final two weeks of her life taking on Colombia single handedly, bungee jumping and paragliding (despite her fear of heights) and was literally having the time of her life," her sister continued.
"Although our pain is indescribable, it is important, and comforting to know that Kishori would have changed nothing about the past year of her life.
"But, it's now time for her to come home. We are already lobbying the Colombian government to release her body, but unfortunately there is also a great deal of expense that needs to be covered even before she is back on home soil."
More than £15,500 has been raised so far by some 700 people.
The Foreign Office said it was supporting Kishori's family and in contact with the local authorities in Colombia.
"Every little helps (literally) and we are already very grateful for the love, support and kindness so many have offered," added Animka.
To donate visit the justgiving page.
CWT and Etihad carbon offset

redpajama_set_name: RedPajamaCommonCrawl


CNC provides managed care programs and related services to individuals receiving benefits under Medicaid and the State Children's Health Insurance Program. CNC has health plans in Indiana, New Jersey, Ohio, Texas and Wisconsin. For the 6 months ended 6/30/05, revenues rose 49% to $682M. Net income rose 42% to $29.7M. Results reflect more memberships of Medicaid managed care group, partially offset by an increase in medical costs.
Centene Corporation is a multi-line, managed-care organization that provides Medicaid and Medicaid-related programs to organizations and individuals through government-subsidized programs, including Medicaid, Supplemental Security Income (SSI) and the State Children's Health Insurance Program (SCHIP). It also provides specialty services, including behavioral health, nurse triage and treatment compliance to its own and other healthcare organizations. The Company has health plans in Indiana, Kansas, Missouri, New Jersey, Ohio, Texas and Wisconsin. It also provides specialty services in each of the states where it has health plans, as well as freestanding programs in Arizona, California and Colorado. Effective January 1, 2004, the Company commenced operations in Ohio through the acquisition of the Medicaid-related assets of Family Health Plan, Inc. Effective December 1, 2004, the Company acquired FirstGuard, Inc. and FirstGuard Health Plan, Inc.
Conseco Inc is a Fortune 500 company. In 2010 Conseco Inc was ranked number 475 on the Fortune 500 list, making it the 475th largest company in the United States when judged by revenue.
Conseco Inc achieved revenue of $4,341.40 million in 2010 and earned a profit of $85.70 million.
The company ranking improved in 2010, moving up the Fortune 500 list to 475th compared to 537th in 2009. This was based on its 2009 revenue of $4,194 million (a change of 0 million compared to 2010) and profits of $-1,127 million (a change of $87 million compared to 2009).
To many investors, profits are more important than the revenue a company earns. If the Fortune 500 was ranked by profits instead of revenue then Conseco Inc would be ranked 363rd rather than 475th due to its profits of $86 in 2010.


Are you a buyer looking for up-to-date North Bay real estate listing information or are you a seller looking to find out the current value of your North Bay home and tips on how to sell it? Either way, this is your most comprehensive site to visit for all things related to real estate in city of North Bay.
Buyers will find current Royal LePage North Bay Real Estate listings as well as having the ability to sign up and receive all North Bay MLS® listings that meet your supplied criteria. Plus find current statistical data from the North Bay Real Estate Board, schooling information for the North Bay area, local community events and important things to know about my beautiful Northern Ontario city.
Sellers can find out the benefits of working with a licensed REALTOR®, tips on selling your home, the services that I offer and most importantly, a FREE North Bay Real Estate Market evaluation to assist you in pricing your current home to attain the top value possible in an ever changing real estate market.


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Cardinals vs. Vikings Week 11 Pick: Low-scoring game expected in Minnesota?
Created: 17 November 2016
Cardinals vs. Vikings Pick
Will Sunday's matchup between the Cardinals and Vikings be low-scoring for bettors?
According to oddsmakers from online sports book BetDSI, this game opened as a pick'em and is currently a pick'em, while the total opened at 41.5 and has been bet down to 40.5. Arizona enters play with a 4-4 record and is 1-2 on the road, while Minnesota is 5-4 overall and 3-1 at home.
CARDINALS KEY TRENDS: The Cardinals have failed to cover the spread in nine of their last 12 games overall, including last week when they were a double-digit home favorite versus the 49ers. They're also just 1-4 against the number in their last five games versus NFC opponents and are 0-5 against the spread in their last five games after accumulating less than 90 yards rushing in their previous contest.
VIKINGS KEY TRENDS: The Vikings are 19-7 against the spread in their last 26 home games and are 36-15 against the number in their last 51 games despite failing to cover in each of their last four games. They're also 16-7 against the spread in their last 23 games coming off a straight up loss and are 6-1 against the number in their last seven games when facing an opponent with a losing record.
OUR PREDICTION: The under is 4-1 in the last five meetings between these two teams, is 4-1 in the Vikings' last five home games and is 12-5 in the Cardinals' last 17 games overall. Both of these teams are banged up on the offensive side of the ball. The Cardinals continue to lean heavily on David Johnson and their running game while the Vikings attempt to use short, quick passes to keep Sam Bradford upright. Both strategies have led to low-scoring games, coupled with the fact that both defenses are solid. It's a low number, but the under should cash.
NFL WEEK 12 PREDICTION: CARDINALS/VIKINGS UNDER 40.5
COLL PRO HOOPS FOR SAT FRI GOOD AGAIN on Sat, Jan 2023 by Timmy1961
FARMERS INS. OPEN AT TORREY PINES ROUNDS 1-4 on Sat, Jan 2023 by Timmy1961


KiOR (NASDAQ: KIOR) is a next generation biofuels company which produces a renewable crude oil substitute. KiOR's production process creates this Re-Crude from biomass by enhancing nature's method of making oil, reducing the process from millions of years to a matter of seconds. KiOR's renewable crude is compatible with our country's existing fuel infrastructure and yields a significant number of societal and environmental benefits.


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Air Force ordered to stand-down tomorrow: NORAD, NORTHCOM on alert for U.N. meetings
By Jerome R. Corsi
Global Research, September 13, 2007
WorldNetDaily.com 13 September 2007
Theme: US NATO War Agenda
Contrary to rumors surrounding the Air Combat Command's stand-down of all 100,000 active-duty airmen ordered for tomorrow, the U.S. will not be devoid of fighter aircraft to protect the nation.
Michael Kucharek, spokesman for NORAD and USNORTHCOM, told WND the stand-down does not include the Air National Guard and Air Force Reserves assigned to NORAD.
About 70 percent of the aircraft involved in NORAD alerts are Air National Guard or Air Force Reserves aircraft, according to Kucharek.
Meanwhile, NORAD and USNORTHCOM will be on alert status Monday when the U.N. convenes a high level meeting on climate change and also Tuesday when the General Assembly begins its 62nd Session in New York City.
The stand-down Friday was ordered by Gen. Ronald Keys to conduct a command-wide review of operations, safety procedures and checklists after the Aug. 30 incident at Minot Air Force Base in North Dakota, according to the Air Force Times.
At Minot, six cruse missiles with nuclear warheads were loaded onto a B-52H and flown to Barksdale Air Force Base in Louisiana – without the bomber crew or ground command realizing nuclear weapons were on the aircraft.
Military sources insisted to WND the incident was a procedural glitch and there is no suspicion within the military of any other purpose.
At the U.N. Monday, Secretary-General Ban Ki-Moon will chair the meetings, and numerous heads of state are likely to attend.
According to Kucharek, Canadian and U.S. NORAD aircraft will be armed and on alert status, prepared to scramble from unspecified NORAD airbases.
Kucharek told WND the aircraft involved in the alert will be F-15s and F-16s assigned to the NORAD Air Defense Deterrence Mission.
Under Operation NOBLE EAGLE, which NORAD has conducted since 9/11, fighters on alert have scrambled from alert sites and diverted from irregular air patrols more than 2,400 times, Kucharek told WND.
More than 44,000 sorties have been flown in support of the missions, including support from tanker and AWACS aircraft.
"NORAD and USNORTHCOM missions," Kucharek said, "are conducted in close collaboration with homeland defense, security and law enforcement partners to prevent air attacks against North America and to safeguard the sovereign airspaces of the United States and Canada by responding to unknown, unwanted and unauthorized air activity approaching and operating within these airspaces, and to provide aerospace and maritime warning for North America."
As WND reported, NORAD is a bi-lateral U.S.-Canada command and USNORTHCOM is a U.S. continental military command that works with its counterpart Canada Command.
Kucharek also confirmed NORAD and USNORTHCOM were scheduled Oct. 15-20 to conduct exercise Vigilant Shield '08, a series of field exercises testing response abilities against a variety of potential threats, including the simulated detonation of three radiological dispersal devices within the USNORTHCOM and U.S. Pacific Command areas of responsibility.
The primary locations for the Vigilant Shield '08 field exercises will be Oregon, Arizona and the territory of Guam.
WND reported Bush administration plans to utilize USNORTHCOM as a U.S. military command to direct the operations of troops deployed in a wide range of continental North American emergencies, including health epidemics, natural disasters, terrorist events and even domestic violence or civil disorder.
Jerome R. Corsi is a staff reporter for WND. He received a Ph.D. from Harvard University in political science in 1972 and has written many books and articles, including his latest best-seller, "The Late Great USA." Corsi co-authored with John O'Neill the No. 1 New York Times best-seller, "Unfit for Command: Swift Boat Veterans Speak Out Against John Kerry." Other books include "Showdown with Nuclear Iran," "Black Gold Stranglehold: The Myth of Scarcity and the Politics of Oil," which he co-authored with WND columnist Craig. R. Smith, and "Atomic Iran."
The original source of this article is WorldNetDaily.com
Copyright © Jerome R. Corsi, WorldNetDaily.com, 2007
Articles by: Jerome R. Corsi


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Q: Empty page with react router in github pages. Package.json home or .env PUBLIC_URL The problem: When i go to any internal root, and press f5, it broke, givin 404. Like for example:
https://josuevalrob.github.io/jeval-web/sign-in. But if I go to the root it works fine: https://josuevalrob.github.io/jeval-web
I don't know how to solve this problem. There is a bunch of documentation about this, and I cant handle it.
This is the github repo: https://github.com/josuevalrob/jeval-web
This is the github Page: https://josuevalrob.github.io/jeval-web
And you can see, the package json have the home key:
  "homepage": "https://josuevalrob.github.io/jeval-web",

Also the .env is currently empty, but i can add this:
PUBLIC_URL = "https://josuevalrob.github.io/jeval-web"

Nevertheless, it doesn't work.
I had added the homepage or the public_url, neither work.

A: Github pages doesn't really support single page applications. Single page applications require a server that serves the same page at every url and then the client renders the appropriate content based on the url. Hence the "single page". Github does not allow you to run server side code, so you can't write a server to serve your index.html at every route.
There is, however, a hack you can use to make this work. When you navigate to a route other than the root url, Github will serve a 404 page as you can see. Github allows you to customize this 404 page. So, you can make the custom 404 page your single page application and then it will be served at every route as required.
This repo explains the required steps to serve your single page as a custom 404 page on Github pages.
Basically it amounts to...

*

*Copy this 404.html page to your repo as is

*Add this redirect script to your index.html page

The only drawback is that the url is forced to redirect and quickly flashes the incorrect URL before redirecting. You can see an example of this by refreshing this page. If you want to avoid this, you need to look for hosting somewhere else that allows you to edit server side code and serve your index.html at every route

A: I had a similar issue with react app. I fixed it by using HashRouter instead of BrowserRouter in App component

redpajama_set_name: RedPajamaStackExchange


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Margaret Trudeau and Diana Nyad to Perform Autobiographical Plays Off-Broadway
Kimberly Senior will direct Trudeau, mother of Canada's current prime minister, in her solo show produced by Audible.
Kimberly Senior will direct Margaret Trudeau in her autobiographical solo show, Certain Woman of an Age, at the Minetta Lane Theatre.
(© Janie Willison)
Audible Inc. has announced two new theatrical events coming to the Minetta Lane Theatre this September. Canadian icon Margaret Trudeau's Certain Woman of an Age, and celebrated long-distance swimmer Diana Nyad's The Swimmer will each feature three-night limited engagements, to be recorded live as Audible Original productions and made available for listeners globally in the coming months.
Margaret Trudeau, former wife of Pierre Trudeau, 15th prime minister of Canada, mother of Justin Trudeau, Canada's current prime minister, and international mental health advocate, brings her intimate staged performance, Certain Woman of an Age, to the Minetta Lane Theatre on September 12, 13, and 14. In the show, Trudeau opens up about her extraordinary life and her encounters with some of the most important icons of our time. The piece is cowritten with Alix Sobler and directed by Kimberly Senior.
At the age of 64, legendary athlete Diana Nyad became the first person in history to make the 111-mile swim from Cuba to Florida without the assistance of a shark cage. In her new play The Swimmer, running September 26, 27, and 28, Nyad shares the heartbreaking setbacks, brushes with death, and the victories that kept her going. The piece is directed by Emmy winner Jane Anderson, and features her longtime friend and coach Bonnie Stoll.
Certain Woman of an Age and The Swimmer will be phone-free experiences. Upon arrival at the theater, guests must secure all phones, smart watches, etc. in a lockable Yondr pouch that will remain in their possession throughout the performance and will be unlocked at the end of the show.
Minetta Lane Theatre
Kimberly Senior
Jane Anderson
Margaret Trudeau
Diana Nyad


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Q: Taking an Integral with respect to time to find the work done on a rocket. I was given a rocket problem for my Calculus 2 class and want to know if it's possible to take an integral of time to find the correct solution. I think it will be easier to explain if I show the problem and expected solution first.
Here is the problem:
A 0.4 kg rocket is loaded with 0.75kg of rocket fuel. After launch, the rocket rises at a constant rate of 4m/s but the rocket fuel is dissipated at a rate of 0.15kg/s. Find the work done in propelling the rocket 20m above the ground.
This is how I found the solution which I know to be the expected path and correct final value:
Rocket:
$m=0.4kg$
$g=9.8m/s^2$
$h=20m$
$$W = mgh =(0.4)(9.8)(20) = 78.4 J$$
Fuel:
$m = 0.75kg$
$Δm = 0.15kg$
$g=9.8m/s^2$
$ m(t) = 0.75 - 0.15t $
$ d=r*t $ where $d=x$ and $r = 4$
so $\frac 4x = t$
$$W = \int^{20}_0 m(t)gdx $$
Substituting in our values:
$$W = \int^{20}_0 (0.75-0.15\frac x4)(9.8)dx $$
$$W = \int^{20}_0 (7.35-1.47\frac x4)dx $$
$$W = 7.35x-1.47\frac {x^2}8 |^{20}_0 $$
$$W = 7.35(20)-1.47\frac {20^2}8=73.5J $$
So the total work done on the rocket is $ 78.4 + 73,.5 = 151.9 J$
Back to my initial question: Is it possible to solve this problem with an integral of time?
I tried to find a time integral like so:
$$W = gΔs\int^x_0 (0.75-0.15t)dt $$
Because g and Δs are constants they can go in front of the integral.
I made our lower bound 0 since it's the start of our time interval.
I set our upper bound to x hoping I would get a solution of 5 because we know from $ d=r*t $
that $ t = 5 $ if we substitute our $4m/s$ and $20m$
Substituting in the values:
$$73.6 = (9.8)(20)\int^x_0 (0.75-0.15t)dt $$
$$73.6= 196(0.75t- \frac {0.15} 2 t^2) $$
$$0= 72t- 14.7t^2-73.6 $$
Solving for t returns $ t = 3.44s$ and $t = 1.45s$
Are these values correct? What am I missing?

A: You can use an integral with respect to time if you'd like, but I would justify it slightly differently: let's start from your original approach:
$$W \equiv \int F \cdot dr = \int_0^{20} mg dx$$
Now we can consider a change of variables: because we have constant velocity $\dot{x} = 4$ and $x(0) = 0,$ we have $x = 4t.$ (this is your $d = rt$) So, using the substitution $t = \frac{x}4, dx = 4 dt$:
$$\int_0^{20} mg dx = \int_0^5 mg (4dt) = 4g \int_0^5 0.75 - 0.15t dt$$
This is where the error in your attempt was: the correct factor to put in front of the integral was your velocity, not the total distance. (a dimensional analysis also would've confirmed that this was a bit off conceptually)
Continuing, we see that this method agrees with your original attempt:
$$(4 \text{m/s})(9.8 \text{m/s}^2)\int_0^5 (0.75-0.15t) \text{kg} \  dt = (4 \text{m/s})(9.8 \text{m/s}^2)\big(0.75(5) - \frac{0.15}{2}(5)^2\big) \text{kg}\cdot\text{s} = \boxed{73.5 \text{J}}$$

Edit: this method can also be made to account for the rocket in the same step by adjusting the mass function:
$$4g\int_0^5 (1.15 - 0.15t) dt = (4)(9.8)\big(1.15(5) - \frac{0.15}{2}(5)^2\big) = \boxed{151.9 \text{J}}$$


Fishing, sailing, kayaking in the Southport Oak Island area of NC's Brunswick Islands is always an adventure. Reel in the fresh catch of the day off Piers and charter fishing boats. Sail or paddle with dolphins. luck or skill for catching the big one to win cash in the U.S. Open King Mackerel Tournament?
CFYC is a general boating club with strong social, youth and cruising divisions for both sailors and power boaters. The Club is available to rent for weddings, receptions, private parties, luncheons, meetings, seminars and other events.


Beginning January 1, 2014, a new Georgia State law (House Bill #48) will require that all coaches complete concussion training prior to performing any coaching duties. Anyone wishing to coach any youth sport with the Glynn County Recreation Department will be required to complete the mandatory training. The training can be completed online at NAYS.org. The training is good for one year and is required for ALL GCRPD coaches of all sports.
Contact Athletic Staff at 912-554-7780 or glynnrec@glynncounty-ga.gov.


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Kendall Feaver 2018 recipient of Belvoir's Philip Parsons Fellowship for Emerging Playwrights
BY www.kabukupr.com.au | 04-Dec-2018
Following a riveting Philip Parsons Memorial lecture from celebrated playwright, Alana Valentine, Belvoir proudly announced the winner of the 2018 Philip Parsons Fellowship for Emerging Playwrights as Kendall Feaver.
Kendall Feaver
Kendall Feaver is one of Australia's most exciting, young playwrights and has recently been gaining recognition and international acclaim for her work. Kendall won a Judges Award at the 2015 Bruntwood Prize for Playwriting – the largest playwriting competition in Europe – for her play, The Almighty Sometimes, which went on to win 'Best New Play' at the 2018 UK Theatre Awards and earned Kendall a nomination for 'Best Writer' at The Stage Debut Awards and made its Australian debut at Griffin Theatre. Previously, Kendall has been shortlisted for the Griffin Award, the Max Afford Playwright's Award and was Highly Commended for the State Library of NSW's Mona Brand Emerging Writer Award. She is currently developing a musical with the National Theatre, London, and is under commission to Manhattan Theatre Club in New York.
The Philip Parsons Fellowship is given annually to an early-career playwright, in the first eight years of their career, with a strong and unique theatrical voice. Feaver will receive a commission to develop a new work with Belvoir's guidance and dramaturgical assistance.
Feaver says of receiving the 2018 Philip Parsons Fellowship;
"I am so thrilled to receive this fellowship and honoured to join a mighty list of past recipients that I have long respected and admired. Playwriting is often a difficult and lonely pursuit, and I am grateful to Belvoir and Create NSW, not just for the time and resources needed to complete a new work, but also for the chance to do so from the inside of a theatre building. I can't wait to create a new play for the Belvoir stage."
Feaver joins an illustrious list of past winners, many of whom have gone on to brilliant careers both within Belvoir and in the greater theatre industry, including; Tommy Murphy, Kate Mulvany, Nakkiah Lui, Brendan Cowell and Zoe Coombs Marr.
The official panel of judges for this year's Philip Parsons Fellowship for Emerging Playwrights say of Kendall and their decision to name her the 2018 Fellow; "Kendall is an exciting new voice making waves around the world. The judges were impressed by the strength and energy of her ideas, and the vibrancy of her theatrical voice. We're thrilled to be working with her at Belvoir."
The Fellowship is given annually in conjunction with the Philip Parsons Memorial Lecture. The Fellowship and Lecture commemorate the life and work of Philip Parsons, AM. Dr Parsons was an influential teacher and mentor to many of Australia's young artists.
The Philip Parsons Fellowship for Emerging Playwrights is supported by Create NSW.
Polar Force
Bogong Centre for Sound Culture [B–CSC] is excited by the upcoming performances of Polar Force, which features the environmental recordings of B–CSC's artistic director Philip Samartzis. Imagine being on the Antarctic ice shelf, housed inside a temporary shelter on the coldest, windiest, and driest continent on earth. Polar Force is a hyper-realistic sound adventure to the Antarctic presented in an inflatable performance installation. Season runs until January 24 at PICA - Perth Institute of Contemporary Arts. @PICA_Perth #PICAARTS #PolarForce #Sound #Music #Perth #bogongsound @bogongsound
Open Studio 2019 - TBSSS Sculpture
The iconic Tom Bass Sculpture Studio School is throwing open its doors on Saturday February 2!
1 ..


text:
HIGH-SCHOOL
2018 Winged Foot Scholar-Athlete Award finalist: Chris Murphy, Community School
Greg Hardwig
It may not seem like it at the moment, but sometimes an injury can be a good thing.
It was in the classroom for Community School of Naples' Chris Murphy.
As a junior when the Seahawks football team played in a showcase in Ireland to open the season, Murphy caught a bubble screen and was flattened by the opposing cornerback. He suffered a concussion, and in addition to not being able to play football, couldn't do a routine school day.
"Once recovered, however, he came back fighting strong," Serrin Boys, a science teacher at the school wrote in a recommendation letter for CSN's Winged Foot Scholar-Athlete Award finalist. "In these first days back, Chris was a true leader, showing that no matter what, you own it and you push on."
More:PrepZone: 2018 Winged Foot Scholar-Athlete finalists announced
Murphy said he wasn't doing well in the class before he had the concussion.
"She was sort of the toughest on me," he said. "I was failing her class. and then I worked with her. I got tutored. I had classmates help me and then I had the best grade in the class. And we did develop a great relationship through that."
When Murphy was trying to figure out where to go to college, he knew what he wanted to keep doing -- play football. He found that and strong academics at the University of Chicago.
"When our football season ended, I was just so upset because I just loved playing football," he said. "I have to do whatever I can to play for another four years after this because I won't be able to finish after high school and be satisfied.
"With that in mind, I just tried to find the best school."
More:Winged Foot Scholar-Athlete banquet: Curtis Strange named keynote speaker
Murphy's favorite high school memory involves football, and it isn't even a game the Seahawks won. In the playoffs, Community School went back and forth with star-studded Champagnat Catholic in Miami.
"They had all of these college recruits," Murphy said. "I was in front of an Alabama recruit. They had other star players. We were up at half. We lost the game with zero time left on a field goal. That was just the hardest I've ever fought for anything -- physically and mentally -- just going through that with my brothers on the team.
"I know it's a loss, so it's not that exciting to talk about, but it's definitely what I'll remember the most."


Gifts to Dover Baptist Church can assist in our mission of spreading the word of our Lord Jesus Christ both now and into the future. Providing gifts can have a positive impact on both the lives of the giver, the Church and our community.
If you wish to make a donation to the Church by sending a check, either designating use for a specific area of interest (Building Fund, Youth Ministries, etc.) or general support, please be sure to include the P.O. Box Number as we have no mail box on the street and without the box number your gift would be returned.
Gift giving can take many forms and often you may wish to remember the Church at the time of your Estate Planning. This is generally accomplished by designating Dover Baptist Church as a beneficiary in your will. You should consult with your attorney or a qualified Estate Planner on the particulars of how to do this.
If gifting the Church with Stocks, you may wish to contact our Investment Executive, John Ackerly IV at Davenport and Company, LLC, Telephone (804) 780-2149 for details on how to best accomplish this.


Does Daniel Need A Treat?
I'd say so. Daniel went to work with me today and he did a grand job. He cleared tables and helped me with this and that. He got 11 dollars in tips and he made a wish.
His big reward was an invite to Crawfish Boil 2009.
One of the things Dan is going to miss most about the south is the food. He loves southern food. Boiled peanuts, crawdads, pork skins, BBQ, grits, and all other southern things.
He was super excited about this big old pile of crawfish goodness. He ate and ate and ate.
Here is Stone (in real life clothes) with his lady Kim.
Kallee Grace taught me how to get into a crawfish. I ate a few. I'm a good sport. I bet Auntie Alma will be proud of me for the hands on experience. Next up: a chicken.
Kru and Kallee Grace make my heart happy. I am going to miss them so much.
I'm going to miss Jim too.
We had the most fun.
Oh that made me sick to look at that pile of whatnot on the table. I guess if you were there you'd have to eat one just to say you did. But I'm thinking I would NOT like it. I would like a glass of sweet tea though...mmmmm!!
Such good memories of crawfish boils. I'm impressed that you would eat a crawfish. You ARE a good sport. The best part is the potatoes and corn though.


Law schools are slowly waking up to the possibility that the entry-level job market undergoing a profound, structural transformation. The trends are not encouraging. Since 2004, total employment in law offices has been flat while law school enrollment increased by 7 percent.
The daunting economics facing law schools is intertwined with heightened business pressures on practicing lawyers. To help ease these pressures, many employers are telling law schools that we need to do a better job producing practice ready graduates who can "hit the ground running."


Where was this weird white stuff… I think the humans call it snow? I wasn't sure what to think at first seeing this snow stuff but when… I heard this noise below the snow then I was all in face and all.
I keep watch for this sound I kept hearing but still haven't actually seen anything yet. I'm very patient even though it was freezing outside.
But then I got a glimpse of a mole when he stuck his head out of a small hole. Oh my gosh, this has just gotten exciting and all bets are off and my name is all over this mole when I catch him.
That mole doesn't stand a chance!
Thank you for your convenience in me, but not sure what I'll do when I catch him!
There is nothing more fun than hunting moles…. The snow makes a bit hard though… I don't know why hoomans think it's so pretty…. It's just cold wet and it keeps us inside. No fun.
It is fun and definitely cold and beautiful but you are right it does keep us in doors.
I'm originally from Arizona so I'm a Desert rat at heart.
Looks cold. Knew that fluffy coat would come in handy someday.
My coat does keep me warm especially my winter coat.
What a cutie. I love seeing animals react to new things. Snow is always an interesting find to animals for the first time.
Thank you. It was a new experience and it was loads of fun too.
Angel was nervous at first but she slowly came out the door on her own time and all a sudden she was all in. I had to make her come in to warm by the fire but five minutes later she was meowing at the door wanting more. LoL!
We hope that mole comes back! You're very brave to stick your face in there.
Good try, you will get him next time.
submit is just excellent and i could suppose you are knowledgeable in this subject.
Awwww Thank you .you can definitely grab our RSS to follow. We also have a cat page called Angel's Eyes – Persian on Facebook. .
the fluids. There is considerable expense involved with installing a septic tank.
I'm glad you are enjoying our post! You can follow us every Thursday here or Angel has her site with daily new post on Facebook @Angel'sEyes-Persian.
Thank you, I've been writing it for 2 yrs i join Katzenworld blog team . But Angel is the star and getting photos of her tells the story without words is really where the inspiration comes from.


Jan. 3, 2019 5:10 p.m.
The B.C. Lions have suspended director of player personnel and player development Torey Hunter 90 days for violating the team's and the CFL's social media policies.
The Lions confirmed Hunter's suspension in a statement on Thursday.
The statement didn't provide details of what Hunter did, but a TSN report alleges Hunter used an anonymous Twitter account to criticize the Edmonton Eskimos, his former team.
The suspension will run until the end of January.


Molasses adds sweetness and color to these rich sandwich cookies and their buttery filling. Try them with a glass of milk or a cup of tea.
1. Preheat oven to 350 degrees. In a small bowl, whisk together flour, baking soda, cinnamon, and salt; set aside.
3. Drop rounded measuring teaspoonfuls of dough onto 2 ungreased (or parchment-lined) baking sheets, about 1 1/2 inches apart.
5. Make Creamy Molasses Filling: Whisk butter with molasses until smooth. Gradually whisk in confectioners' sugar; whisk until smooth and spreadable. Makes 1 1/2 cups.
6. Spread a rounded measuring teaspoonful of Creamy Molasses Filling on the flat side of a cookie; place another cookie on top, and gently press. Repeat until all cookies are filled. Store in an airtight container at room temperature up to 1 day, or refrigerate up to 3 days (cookies may soften during refrigeration).
Use a round, not oval, measuring teaspoon for scooping dough. Before scooping, dip spoon in water to make sure dough doesn't stick.
Say the recipe for the filling is "below". It is not there and I cannot find it on the site.
I think I'd use a lemon-ginger filling with these tasty cookies.
These were okay. The filling is very sweet and buttery. I also found 12 - 15 mins to be WAY too long. Using the cookie size in the recipe, 7 - 8 mins baked a cookie that was done but still a little soft. I would not make these again unfortunately.
Has anyone tried making a cheese cream type frosting for the filling? So following the same recipe pretty much but adding cream cheese and decreasing the butter?
Yep, everyone is right...these cookies are addictive. This is one of my favorite cookie recipes of all time (and my all-time list is rather small, so the select ones on it are tops in my opinion)! I also think they are surprisingly easy to make. The result gives the impression that you did more work than you actually put in, in other words! I used the smallest cookie scoop, leveled off, and the cookies were a perfect size and pretty symmetrical. Thanks for a great recipe!
These cookies really are out of this world. I've made them twice and each time they have turned out perfect. Definitely do not overbake the cookies. And if you have extra filling, it is awesome on pancakes!!!
These are fabulous, and easier than I expected. I took them to a potluck where there were about 10 times as many desserts as we needed, and they disappeared in a matter of minutes. Since the cookies need to "match" to sandwich up neatly, it's very helpful to use a very small cookie scoop or a round measuring spoon to get the size uniform, and also cool the sheets between batches. The filling recipe does make quite a bit more than necessary, so we ate it as a spread on toast!


The beginnings of NCAR and UCAR are detailed in this digital collection of unique materials. There are more than 60 original documents created during the infancy of UCAR and NCAR, including correspondence and official meeting minutes.
Following a report issued by the National Research Council in 1958 about the lack of research performed on the earth's atmosphere, the science community decided to establish a national institute devoted to atmospheric sciences. In February of that year, the first meeting to establish the institute (originally called the National Institute of Atmospheric Research) took place, during which the University Committee on Atmospheric Research (UCAR, now the University Corporation for Atmospheric Research) was appointed to oversee the process.
Over a period of several years, UCAR secured funding from the National Science Foundation, as well as the interest and involvement of multiple universities, selected a site for the facility in Boulder, Colorado, and appointed leaders for the institute. By 1960, the institute (by then called the National Center for Atmospheric Research) began operations, though UCAR's work was not complete. UCAR continued to call regular meetings to discuss the leadership of NCAR and its long-term plans.
The UCAR's Beginnings digital collection contains more than 60 original documents created during the infancy of UCAR and NCAR, including important correspondence and official meeting minutes.


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/en/forschung/institute/ilp/sitemap.json
Institute of Laser Physics
of Laserphysics
About ILP
History of the ILP
Direction and Contact
Beginner's practical training
Advanced practical training
Lights & Schools
Atom Optics Group
Theory Group Ultra-cold atoms
Quantum Matter Group
Theory Group of Fundamental Processes in Quantum Physics
Non-linear Quantum optics
Quantum Gases Group
ZOQ
Guest Programme & Workshops
How to get to the ZOQ
Photo: AG Schnabel
This page:UHH > MIN > Department of Physics > Research > Institutes > Institute of Laser Physics > Research > Quantum Gases Group > Research > Theory: Quantum simulation of solids > Publications
Observation of dynamical vortices after quenches in a system with topology
N. Fläschner, D. Vogel, M. Tarnowski, B. S. Rem, D.-S. Lühmann, M. Heyl, J. C. Budich, L. Mathey, K. Sengstock, C. Weitenberg
Topological phases constitute an exotic form of matter characterized by non-local properties rather than local order parameters. The paradigmatic Haldane model on a hexagonal lattice features such topological phases distinguished by an integer topological invariant known as the first Chern number. Recently, the identification of non-equilibrium signatures of topology in the dynamics of such systems has attracted particular attention. Here, we experimentally study the dynamical evolution of the wavefunction using time- and momentum-resolved full state tomography for spin-polarized fermionic atoms in driven optical lattices. We observe the appearance, movement and annihilation of dynamical vortices in momentum space after sudden quenches close to the topological phase transition. These dynamical vortices can be interpreted as dynamical Fisher zeros of the Loschmidt amplitude, which signal a so-called dynamical phase transition. Our results pave the way to a deeper understanding of the connection between topological phases and non-equilibrium dynamics.
Nature Physics 14, 265 (2018)
Twisted superfluid phase in the extended one-dimensional Bose-Hubbard
D.-S. Lühmann
Phys. Rev. A 94, 011603(R)
Experimental Reconstruction of the Berry Curvature in a Floquet Bloch Band
N. Fläschner, B. Rem, M. Tarnowski, D. Vogel, D.-S. Lühmann, K. Sengstock, C. Weitenberg
Topological properties lie at the heart of many fascinating phenomena in solid-state systems such as quantum Hall systems or Chern insulators. The topology of the bands can be captured by the distribution of Berry curvature, which describes the geometry of the eigenstates across the Brillouin zone. Using fermionic ultracold atoms in a hexagonal optical lattice, we engineered the Berry curvature of the Bloch bands using resonant driving and show a full momentum-resolved measurement of the ensuing Berry curvature. Our results pave the way to explore intriguing phases of matter with interactions in topological band structures
Science 352, 1091 (2016)
Symmetry-broken momentum distributions induced by matter-wave diffraction during time-of-flight expansion of ultracold atoms
M. Weinberg, O. Jürgensen, C. Ölschläger, D.-S. Lühmann, K. Sengstock, J. Simonet
We study several effects which lead to symmetry-broken momentum distributions of quantum gases released from optical lattices. In particular, we demonstrate that interaction within the first milliseconds of the time-of-flight expansion can strongly alter the measurement of the initial atomic momentum distribution. For bosonic mixtures in state-dependent lattices, inter-species scattering processes lead to a symmetry breaking in momentum space. The underlying mechanism is identified to be diffraction of the matter wave from the total density lattice, which gives rise to a timedependent interaction potential. Our findings are of fundamental relevance for the interpretation of time-of-flight measurements and for the study of exotic quantum phases such as the twisted superfluid. Beyond that, the observed matter-wave diraction can also be used as an interferometric probe. In addition, we report on diffraction from the state-dependent standing light field, which leads to the same symmetry-broken momentum distributions, even for single component condensates.
Emulating molecular orbitals and electronic dynamics with ultracold atoms
D.-S. Lühmann, C. Weitenberg, K. Sengstock
In the recent years, ultracold atoms in optical lattices have proven their great value as quantum simulators for studying strongly-correlated phases and complex phenomena in solid-state systems. Here we reveal their potential as quantum simulators for molecular physics and propose a technique to image the three-dimensional molecular orbitals with high resolution. The outstanding tunability of ultracold atoms in terms of potential and interaction offer fully-adjustable model systems for gaining deep insight into the electronic structure of molecules. We study the orbitals of an artificial benzene molecule and discuss the effect of tunable interactions in its conjugated pi electron system with special regard to localization and spin order. The dynamical timescale of ultracold atom simulators are on the order milliseconds which allow for the time-resolved monitoring of a broad range of dynamical processes. As an example, we compute the hole dynamics in the conjugated pi system of the artificial benzene molecule.
Twisted complex superfluids in optical lattices
O. Jürgensen, K. Sengstock, D.-S. Lühmann
We show that correlated pair tunneling drives a phase transition to a twisted superfluid with a complex order parameter. This unconventional superfluid phase spontaneously breaks the time-reversal symmetry and is characterized by a twisting of the complex phase angle between adjacent lattice sites. We discuss the entire phase diagram of the extended Bose--Hubbard model for a honeycomb optical lattice showing a multitude of quantum phases including twisted superfluids, pair superfluids, supersolids and twisted supersolids. Furthermore, we show that the nearest-neighbor interactions breaks the inversion symmetry of the lattice and gives rise to dimerized density-wave insulators, where particles are delocalized on dimers. For two components, we find twisted superfluid phases with strong correlations between the species already for surprisingly small pair-tunneling amplitudes. Interestingly, this ground state shows an infinite degeneracy ranging continuously from a supersolid to a twisted superfluid.
Scientific Reports 5, 12912 (2015)
Non-standard Hubbard models in optical lattices: a review
O. Dutta, M. Gajda, P. Hauke, M. Lewenstein, D.-S. Lühmann, B. A. Malomed, T. Sowiński, J. Zakrzewski
Originally, the Hubbard model has been derived for describing the behaviour of strongly-correlated electrons in solids. However, since over a decade now, variations of it are also routinely being implemented with ultracold atoms in optical lattices. We review some of the rich literature on this subject, with a focus on more recent non-standard forms of the Hubbard model. After an introduction to standard (fermionic and bosonic) Hubbard models, we discuss briefly common models for mixtures, as well as the so called extended Bose-Hubbard models, that include interactions between neighboring sites, next-neighboring sites, and so on. The main part of the review discusses the importance of additional terms appearing when refining the tight-binding approximation on the original physical Hamiltonian. Even when restricting the models to the lowest Bloch band is justified, the standard approach neglects the density-induced tunneling (which has the same origin as the usual on-site interaction). The importance of these contributions is discussed for both contact and dipolar interactions. For sufficiently strong interactions, also the effects related to higher Bloch bands become important even for deep optical lattices. Different approaches that aim at incorporating these effects, mainly via dressing the basis Wannier functions with interactions, leading to effective, density-dependent Hubbard-type models, are reviewed. We discuss also examples of Hubbard-like models that explicitly involve higher p-orbitals, as well as models that couple dynamically spin and orbital degrees of freedom. Finally, we review mean-field nonlinear-Schrödinger models of the Salerno type that share with the non-standard Hubbard models the nonlinear coupling between the adjacent sites. In that part, discrete solitons are the main subject of the consideration. We conclude by listing some future open problems.
Originally, the Hubbard model was derived for describing the behavior of strongly correlated electrons in solids. However, for over a decade now, variations of it have also routinely been implemented with ultracold atoms in optical lattices, allowing their study in a clean, essentially defect-free environment. Here, we review some of the vast literature on this subject, with a focus on more recent non-standard forms of the Hubbard model. After giving an introduction to standard (fermionic and bosonic) Hubbard models, we discuss briefly common models for mixtures, as well as the so-called extended Bose–Hubbard models, that include interactions between neighboring sites, next-neighbor sites, and so on. The main part of the review discusses the importance of additional terms appearing when refining the tight-binding approximation for the original physical Hamiltonian. Even when restricting the models to the lowest Bloch band is justified, the standard approach neglects the density-induced tunneling (which has the same origin as the usual on-site interaction). The importance of these contributions is discussed for both contact and dipolar interactions. For sufficiently strong interactions, the effects related to higher Bloch bands also become important even for deep optical lattices. Different approaches that aim at incorporating these effects, mainly via dressing the basis, Wannier functions with interactions, leading to effective, density-dependent Hubbard-type models, are reviewed. We discuss also examples of Hubbard-like models that explicitly involve higher p orbitals, as well as models that dynamically couple spin and orbital degrees of freedom. Finally, we review mean-field nonlinear Schrödinger models of the Salerno type that share with the non-standard Hubbard models nonlinear coupling between the adjacent sites. In that part, discrete solitons are the main subject of consideration. We conclude by listing some open problems, to be addressed in the future.
Rep. Prog. Phys. 78, 066001 (2015)
Observation of Density-Induced Tunneling
O. Jürgensen, F. Meinert, M. J. Mark, H.-C. Nägerl, D.-S. Lühmann
We study the dynamics of bosonic atoms in a tilted one-dimensional optical lattice and report on the first direct observation of density-induced tunneling.We show that the interaction affects the time evolution of the doublon oscillation via density-induced tunneling and pinpoint its density and interaction dependence. The experimental data for different lattice depths are in good agreement with our theoretical model. Furthermore, resonances caused by second-order tunneling processes are studied, where the density-induced tunneling breaks the symmetric behavior for attractive and repulsive interactions predicted by the Hubbard model.
Dimerized Mott insulators in hexagonal optical lattices
O. Jürgensen, D.-S. Lühmann
We study bosonic atoms in optical honeycomb lattices with anisotropic tunneling and find dimerized Mott insulator (MI) phases with fractional filling. These incompressible insulating phases are characterized by an interaction-driven localization of particles in respect to the individual dimers and large local particle-number fluctuations within the dimers. We calculate the ground-state phase diagrams and the excitation spectra using an accurate cluster mean-field method. The cluster treatment enables us to probe the fundamental excitations of the dimerized MI where the excitation gap is dominated by the intra-dimer tunneling amplitude. This allows the distinction from normal Mott insulating phases gapped by the on-site interaction. In addition, we present analytical results for the phase diagram derived by a higher-order strong-coupling perturbative expansion approach. By computing finite lattices with large diameters the influence of a harmonic confinement is discussed in detail. It is shown that a large fraction of atoms forms the dimerized MI under experimental conditions. The necessary anisotropic tunneling can be realized either by periodic driving of the optical lattice or by engineering directly a dimerized lattice potential. The dimers can be mapped to their antisymmetric states creating a lattice with coupled p-orbitals.
Quantum phases in tunable state-dependent hexagonal optical lattices
D.-S. Lühmann, O. Jürgensen, M. Weinberg, J. Simonet, P. Soltan-Panahi, K. Sengstock
We study the ground-state properties of ultracold bosonic atoms in a state-dependent graphene-like honeycomb optical lattice, where the degeneracy between the two triangular sublattices A and B can be lifted. We discuss the various geometries accessible with this lattice setup and present a novel scheme to control the energy offset with external magnetic fields. The competition of the on-site interaction with the offset energy leads to Mott phases characterized by population imbalances between the sublattices. For the definition of an optimal Hubbard model, we demonstrate a scheme that allows for the efficient computation of Wannier functions. Using a cluster mean-field method, we compute the phase diagrams and provide a universal representation for arbitrary energy offsets. We find good agreement with the experimental data for the superfluid to Mott insulator transition.
Large-Amplitude Superexchange of High-Spin Fermions in Optical Lattices
O. Jürgensen, J. Heinze, D.-S. Lühmann
We show that fermionic high-spin systems with spin-changing collisions allow to monitor superexchange processes in optical superlattices with large amplitudes and strong spin fluctuations. By investigating the non-equilibrium dynamics, we find a superexchange dominated regime at weak interactions. The underlying mechanism is driven by an emerging tunneling-energy gap in shallow few-well potentials. As a consequence, the interaction-energy gap that is expected to occur only for strong interactions in deep lattices is reestablished. By tuning the optical lattice depth, a crossover between two regimes with negligible particle number fluctuations is found: first, the common regime with vanishing spin-fluctuations in deep lattices and, second, a novel regime with strong spin fluctuations in shallow lattices. We discuss the possible experimental realization with ultracold 40K atoms and observable quantities in double wells and two-dimensional plaquettes.
Cluster Gutzwiller method for bosonic lattice systems
A versatile and numerically inexpensive method is presented allowing the accurate calculation of phase diagrams for bosonic lattice models. By treating clusters within the Gutzwiller theory, a surprisingly good description of quantum fluctuations beyond the mean-field theory is achieved approaching quantum Monte Carlo predictions for large clusters. Applying this powerful method to the Bose-Hubbard model, we demonstrate that it yields precise results for the superfluid to Mott-insulator transition in square, honeycomb, and cubic lattices. Due to the exact treatment within a cluster, the method can be effortlessly adapted to more complicated Hamiltonians in the fast progressing field of optical lattice experiments. This includes state- and site-dependent superlattices, large confined atomic systems, and disordered potentials, as well as various types of extended Hubbard models. Furthermore, the approach allows an excellent treatment of systems with arbitrary filling factors. We discuss the perspectives that allow for the computation of large, spatially varying lattices, low-lying excitations, and time evolution.
Density-induced processes in quantum gas mixtures in optical lattices
We show that off-site processes and multi-orbital physics have a crucial impact on the phase diagram of quantum gas mixtures in optical lattices. In particular, we discuss Bose-Fermi mixtures where the intra- and interspecies interactions induce competing density-induced hopping processes, the so-called bond-charge interactions. Furthermore, higher bands strongly influence tunneling and on-site interactions. The resulting decrease of the tunneling competes with a decrease of the total on-site interaction energy both affecting the critical lattice depth of the superfluid to Mott insulator transition. In contrast to the standard Bose-Fermi-Hubbard model, we predict a large shift of the transition to shallower lattice depths with increasing Bose-Fermi attraction.
Multi-orbital and density-induced tunneling of bosons in optical lattices
D.-S. Lühmann, O. Jürgensen, K. Sengstock
We show that multi-orbital and density-induced tunneling have significant impact on the phase diagram of bosonic atoms in optical lattices. Off-site interactions lead to density-induced hopping, so-called bond-charge interactions and can reach the same order of magnitude as conventional tunneling. In addition, interaction-induced higher-band processes also give rise to strongly modified tunneling, on-site, and bond-charge interactions. The derived phase diagram deviates substantially from the single-band Bose-Hubbard predictions indicating strong changes of the SF-MI transition point.
Coherent multi-flavour spin dynamics in a fermionic quantum gas
J. S. Krauser, J. Heinze, N. Fläschner, S. Götze, O. Jürgensen, D.-S. Lühmann, C. Becker, K. Sengstock
We demonstrate the first experimental realization of a well‐controlled fermionic spinor gas with interaction‐driven spin oscillations. By properly choosing the initial spin states we can change the effective length of the atomic spin from 1/2 to 9/2. The control over the magnetic field allows to initialize and stop spin dynamics and to select the number of involved levels. We extract the microscopic interaction parameters and find excellent agreement with a two particle model including all spin‐dependent interactions. By tuning the depth of the optical lattice, we investigated the transition from on‐site dominated to quantum manybody spin dynamics, where spins diffuse throughout the lattice producing highly entangled states. For this case, we observe a new form of melting of a band insulator.
Nature Physics 8, 813–818 (2012)
http://arxiv.org/abs/1203.0948v1
Quantum phase transition to unconventional multi-orbital superfluidity in optical lattices
P. Soltan-Panahi, D.-S. Lühmann, J. Struck, P. Windpassinger, K. Sengstock
Orbital physics plays a significant role for a vast number of important phenomena in complex condensed matter systems such as high-Tc superconductivity and unconventional magnetism. In contrast, phenomena in superfluids - especially in ultracold quantum gases - are commonly well described by the lowest orbital and a real order parameter. Here, we report on the observation of a novel multi-orbital superfluid phase with a complex order parameter in binary spin mixtures. In this unconventional superfluid, the local phase angle of the complex order parameter is continuously twisted between neighboring lattice sites. The nature of this twisted superfluid quantum phase is an interaction-induced admixture of the p-orbital favored by the graphene-like band structure of the hexagonal optical lattice used in the experiment. We observe a second-order quantum phase transition between the normal superfluid (NSF) and the twisted superfluid phase (TSF) which is accompanied by a symmetry breaking in momentum space. The experimental results are consistent with calculated phase diagrams and reveal fundamentally new aspects of orbital superfluidity in quantum gas mixtures. Our studies might bridge the gap between conventional superfluidity and complex phenomena of orbital physics.
Nature Physics 8, 71–75 (2012)
Multi-band spectroscopy of ultracold fermions: Observation of reduced tunneling in attractive Bose-Fermi mixtures
J. Heinze, S. Götze, J. S. Krauser, B. Hundt, N. Fläschner, D.-S. Lühmann, C. Becker, K. Sengstock
We perform a detailed experimental study of the band excitations and tunneling properties of ultracold fermions in optical lattices. Employing a novel multi-band spectroscopy for fermionic atoms we can measure the full band structure and tunneling energy with high accuracy. In an attractive Bose-Fermi mixture we observe a significant reduction of the fermionic tunneling energy, which depends on the relative atom numbers. We attribute this to an interaction-induced increase of the lattice depth due to self-trapping of the atoms.
Time-resolved observation of coherent multi-body interactions in quantum phase revivals
S. Will, T. Best, U. Schneider, L. Hackermüller, D.-S. Lühmann, and I. Bloch
Interactions lie at the heart of correlated many-body quantum phases. Typically, the interactions between microscopic particles are described as two-body interactions. However, it has been shown that higher-order multi-body interactions could give rise to novel quantum phases with intriguing properties. So far, multi-body interactions have been observed as inelastic loss resonances in three-and four-body recombinations of atom-atom and atom-molecule collisions. Here we demonstrate the presence of effective multi-body interactions in a system of ultracold bosonic atoms in a three-dimensional optical lattice, emerging through virtual transitions of particles from the lowest energy band to higher energy bands. We observe such interactions up to the six-body case in time-resolved traces of quantum phase revivals, using an atom interferometric technique that allows us to precisely measure the absolute energies of atom number states at a lattice site. In addition, we show that the spectral content of these time traces can reveal the atom number statistics at a lattice site, similar to foundational experiments in cavity quantum electrodynamics that yield the statistics of a cavity photon field. Our precision measurement of multi-body interaction energies provides crucial input for the comparison of optical-lattice quantum simulators with many-body quantum theory.
Nature 465, 197 (2010)
Probing superfluids in optical lattices by momentum-resolved Bragg spectroscopy
Philipp T. Ernst, Sören Götze, Jasper S. Krauser, Karsten Pyka, Dirk-Sören Lühmann, Daniela Pfannkuche, and Klaus Sengstock
The fundamental concept of superfluidity gives rise to fascinating effects and collective behaviour such as vortex creation and second sound. Using quantum gases in optical lattices, superfluids can be realized over a wide range of tunable parameters, with a continuous connection to the regime of strong correlation. However, for full experimental access and a comprehensive comparison with condensed-matter systems, there is a need for new detection techniques to probe their essential physics. Here we report on a comprehensive study of superfluids in optical lattices by Bragg spectroscopy. We present fully momentum-resolved measurements of the band structure and associated interaction effects at several lattice depths. In addition, we directly study the composition of excitations and observe strong indications for Bogoliubov backscattering. Our measurements demonstrate the applicability and limits of the Bogoliubov theory to describe excitation properties of superfluids in periodic potentials and should pave the way for detailed studies of strongly correlated phases.
Nature Physics 6, 56 (2010)
Kronjaeger2009-Spontaneous-pattern-formation-XXX-0904.2339v1-02 (PDF)
Role of Interactions in 87Rb-40K Bose-Fermi Mixtures in a 3D Optical Lattice
T. Best, S. Will, U. Schneider, L. Hackermüller, D. van Oosten, I. Bloch, and D.-S. Lühmann
We investigate the effect of interspecies interaction on a degenerate mixture of bosonic Rb-87 and fermionic K-40 atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the Rb-87-K-40 interaction is tuned over a wide range. Through an analysis of the Rb-87 momentum distribution, we find a pronounced asymmetry between strong repulsion and strong attraction. In the latter case, we observe a marked shift in the superfluid to Mott insulator transition, which we attribute to a renormalization of the Bose-Hubbard parameters due to self-trapping.
Physical Review Letters 102, 030408 (2009)
Self-Trapping of Bosons and Fermions in Optical Lattices
D.-S. Lühmann, K. Bongs, K. Sengstock, and D. Pfannkuche
We theoretically investigate the enhanced localization of bosonic atoms by fermionic atoms in three-dimensional optical lattices and find a self-trapping of the bosons for attractive boson-fermion interaction. Because of this mutual interaction, the fermion orbitals are substantially squeezed, which results in a strong deformation of the effective potential for bosons. This effect is enhanced by an increasing bosonic filling factor leading to a large shift of the transition between the superfluid and the Mott-insulator phase. We find a nonlinear dependency of the critical potential depth on the boson-fermion interaction strength. The results, in general, demonstrate the important role of higher Bloch bands for the physics of attractively interacting quantum gas mixtures in optical lattices and are of direct relevance to recent experiments with Rb-87-K-40 mixtures, where a large shift of the critical point has been found.
Localization and delocalization of ultracold bosonic atoms in finite optical lattices
We study bosonic atoms in small optical lattices by exact diagonalization and observe a striking similarity to the superfluid to Mott insulator transition in macroscopic systems. The momentum distribution, the formation of an energy gap, and the pair correlation function show only a weak size dependence. For noncommensurate filling we reveal in deep lattices a mixture of localized and delocalized particles, which is sensitive to lattice imperfections. Breaking the lattice symmetry causes a Bose-glass-like behavior. We discuss the nature of excited states and orbital effects by using an exact diagonalization technique that includes higher bands.
Physical Review A 77, 023620 (2008)
Quantum gases in driven optical lattices
Bose-Fermi mixtures
Ytterbium Quantum Gases
Quantum Hybrid Systems
Lithium Microscope
Theory: Quantum simulation of solids
Selected recent publications
Femto-BEC
BEC in Space


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ArtsBeat | Holocaust Survivor Recalls 'Brundibar,' a Children's Opera
Holocaust Survivor Recalls 'Brundibar,' a Children's Opera
By Raphael Minder
April 4, 2016 12:30 pm April 4, 2016 12:30 pm
A scene from "Brundibar," at the Teatro Real in Madrid, with Jorge Marín Rodríguez, center.Credit Javier del Real/Teatro Real
MADRID — Dagmar Lieblova was 14 in 1943, when she sang in the children's opera "Brundibar" at the Terezin concentration camp near Prague. The performance was part of a Nazi effort to present the camp as a model ghetto rather than a transit point to Auschwitz and the gas chambers.
On Sunday, Ms. Lieblova, now 86, watched as another group of young singers had a final rehearsal for "Brundibar," which opens on Saturday at the Teatro Real opera house here. Before the rehearsal, she told them about her own performances, noting that "our chorus had to be renewed all the time, as children would be taken away."
Dagmar Lieblova, who performed in the opera in a concentration camp in 1943.Credit Javier del Real/Teatro Real
"Brundibar" is part of a three-month program of music, mostly composed by Jews in the 1930s and 1940s, that the Teatro Real has organized around the Madrid premiere of Arnold Schoenberg's landmark opera "Moses und Aron."
"Moses und Aron," which will open in late May, "needs the proper context to be understood, also so that the audience can lose its fear because it is normally seen as a complicated opera," said Joan Matabosch, the artistic director of the Teatro Real.
The fact that the broader program has works created during the Holocaust is pertinent, Mr. Matabosch added, because "you can almost say that Schoenberg's opera is a shocked response to the spiral of anti-Semitism."
The composer of "Brundibar," Hans Krasa, died at Auschwitz, alongside most of those who performed it in Terezin (also known by its German name, Theresienstadt). Ms. Lieblova lost her parents and sister in Auschwitz, but she was spared when she was sent to Hamburg to help clear the ruins of the city.
"Brundibar" tells the story of young siblings looking for milk for their sick mother. They hit upon the idea of singing to raise cash, but that sparks the wrath of the town's greedy organ grinder, Brundibar. Eventually, with the help of three animals, the siblings and the town's other children defeat Brundibar.
Ms. Lieblova said in an interview that singing the opera in the camp — and being exempted by the Nazis from wearing the star of David while performing it — amounted to a "special moment in which we didn't have to think about all our problems but could think instead that one day we would return home, to our school, and nothing else bad could ever happen to us."
The Teatro Real presents Brundibar as a "TV showman" who deceives children, said Jordi Francés, the opera's musical director. Mr. Francés said he wanted "to turn the page" and separate "Brundibar" from the tragic circumstances in which it was first staged. In Madrid, Brundibar sports an Elvis Presley-style haircut and wears a glittery blue suit with matching boots.
After the rehearsal, Ms. Lieblova said that it had been "very special to see it in such a huge opera house," compared to the smaller theaters and other venues in which "Brundibar" has normally been staged.
As to what it could mean for Spanish children not acquainted with the Holocaust, she said: "At the time we sang it, we didn't see it as a project for the future, but 'Brundibar' can now be used to remember the past in a way that children can understand. It can also be a warning for the future."
"But first of all, the music is good — and let us not forget that," she said.
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