Raman Spectroscopy Study of Lattice Vibration and Crystallographic Orientation of Monolayer MoS2 under Uniaxial Strain

Abstract

The false-color (3D type) image of the intensity of the Raman spectra of monolayer MoS₂ versus both peak positions and polar angles is plotted. It shows that the strongest E_2g¹⁺ and E_2g¹⁻ peaks appear at different angles, reflected as the alternation of the maxima of the intensity within the frequency range of the E_2g¹ mode, which is the consequence of the crystallographic orientation relevant to the strain direction as predicted by theoretical analysis.