Lattice dynamics in mono- and few-layer sheets of WS2 and WSe2
Lattice dynamics in mono- and few-layer sheets of WS2 and WSe2
Thickness is one of the fundamental parameters that define the electronic, optical, and thermal properties of two-dimensional (2D) crystals. Phonons in molybdenum disulfide (MoS2) were recently found to exhibit unique thickness dependence due to the interplay between short and long range interactions. Here we report Raman spectra of atomically thin …