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We systematically investigate polarization-dependent Raman spectra of amonolayer crystal of WS2 on the (100) and (230) surfaces of diamond. At ambientpressure, identical polarization dependence of the Raman spectra is observed onthe different surfaces, independent of the orientation of the monolayer crystalrelative to the diamond crystal. However, when monolayer WS2 is compressed toabout 4 GPa, an abrupt drop of the intensity of the 2LA mode relative to the A'mode occurs on the (100) surface and the (230) surface with the zigzagdirection along the atomic step edges of the (230) surface. In contrast, nosuch drop is observed when the armchair direction is along or at 15{\deg} tothe atomic steps of the (230) surface. We also observe a shift of thepolarization angle of the intensity maxima of the 2LA and A' modes on (230)surface during compression. These results demonstrate that the atomic steps ofa vicinal surface strongly modify the vibrational response under high pressure.

Orientation- and pressure-dependence of the vibrational response of a monolayer crystal on a vicinal diamond surface