In most cases, back pain will improve in a few weeks or months, although some people experience long-term pain or pain that keeps coming back. Types of back pain Backache is most common in the lower back ('lumbago'), although it can be felt anywhere along your spine, from your neck down to your hips.
Graphene is made of a single layer of carbon atoms that are bonded together in a repeating pattern of hexagons. Graphene is one million times thinner than paper; so thin that it is actually considered two dimensional. Carbon is an incredibly versatile element.
The symmetry can also be broken by doping one layer of graphene with metal atoms, but such doping is hard to control. The team built their device by making a bottom gate layer out of silicon, with a thin layer of silicon oxide as an insulator. On top, they placed the two layers of graphene, with gold at each end to act as a source and a drain.