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Single crystal tungsten ditelluride (WTe2) has recently been discovered toexhibit non-saturating extreme magnetoresistance in bulk; it has also emergedas a new layered material from which atomic layer crystals can be extracted.While atomically thin WTe2 is attractive for its unique properties, littlestudy has been conducted on single- and few-layer WTe2. Here we report theisolation of single- and few-layer WTe2, as well as fabrication andcharacterization of the first WTe2 suspended nanostructures. We have observednew Raman signatures of few-layer WTe2 that have been theoretically predictedbut not yet reported to date, in both on-substrate and suspended WTe2 flakes.We have further probed the nanomechanical properties of suspended WTe2structures by measuring their flexural resonances, and obtain a Young's modulusof E_Y~80GPa for the suspended WTe2 flakes. This study paves the way for futureinvestigations and utilization of the multiple new Raman fingerprints ofsingle- and few-layer WTe2, and for exploring mechanical control of WTe2 atomiclayers.

Single- and Few-Layer WTe2 and Their Suspended Nanostructures: Raman Signatures and Nanomechanical Resonances