Fig. 4: Pressure-modulated elastic constants and lattice dynamics of few-layer 2H-MoS2.
a MCM of MoS2 on a solid substrate. b Evolution of force constants (\({\alpha }^{\perp }\) and \({\alpha }^{\parallel }\)) and moduli (C33 and C44) of LB and S modes of MoS2 under high pressure. The solid and empty symbols denote the exp. and MD results, respectively. The changes in the force constant and modulus under high pressure seem linear, leading to the nonlinear dependence of Raman scattering on pressure. cN-dependence of Raman shifting rates of dω(LB)/dP and dω(S)/dP of MoS2. Note that dω(LB)/dP and dω(S)/dP intersect when N approaches to ~4. The soild, empty, and empty with X intersection symbols denote the exp., DFT, and MCM results, respectively. The dahsed and solid lines are guides for the eyes.
