  Single crystal tungsten ditelluride (WTe2) has recently been discovered to
exhibit non-saturating extreme magnetoresistance in bulk; it has also emerged
as a new layered material from which atomic layer crystals can be extracted.
While atomically thin WTe2 is attractive for its unique properties, little
study has been conducted on single- and few-layer WTe2. Here we report the
isolation of single- and few-layer WTe2, as well as fabrication and
characterization of the first WTe2 suspended nanostructures. We have observed
new Raman signatures of few-layer WTe2 that have been theoretically predicted
but not yet reported to date, in both on-substrate and suspended WTe2 flakes.
We have further probed the nanomechanical properties of suspended WTe2
structures by measuring their flexural resonances, and obtain a Young's modulus
of E_Y~80GPa for the suspended WTe2 flakes. This study paves the way for future
investigations and utilization of the multiple new Raman fingerprints of
single- and few-layer WTe2, and for exploring mechanical control of WTe2 atomic
layers.

Mesoscale and Nanoscale Physics