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Anomalous Raman spectra and thickness-dependent electronic properties of WSe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>
Typical Raman spectra of transition-metal dichalcogenides (TMDs) display two prominent peaks, ${E}_{2g}$ and ${A}_{1g}$, that are well separated from each other. We find that these modes are degenerate in bulk WSe${}_{2}$ yielding one single Raman peak in contrast to other TMDs. As the dimensionality is lowered, the observed peak splits …