Optical Properties of Molybdenum Disulfide (MoS_2)

Abstract

Research of a monolayer and a bulk MoS2 is reported. The room temperature Raman spectra of the natural MoS2 crystals for the both resonant (632.8 nm) and the non-resonant (532 nm) excitation are presented. The apparent dierences observed in the spectra from the bulk and the one monolayer MoS2 are discussed. In particular, the feature due to a rst order scattering involving the LA(M ) phonon in the resonance Raman spectrum of the one monolayer MoS2 was observed and explained in terms of the disorder in the natural crystal. The disorder is also documented by the line-shape of the room-temperature photoluminescence spectra observed from both the bulk and the one monolayer MoS2.