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We studied helicity resolved Raman scattering in PtSe$_2$ flakes withdifferent thicknesses. The peak amplitude of helicity-switched Raman scatteringis significantly larger than that of helicity-conserved scattering for thein-plane $E_{g}$ mode, consistent with the Raman tensor analyses andconservation law of angular momentum. The peak amplitude of thehelicity-switched $E_{g}$ mode is larger for the thinner flakes. In addition,we find Raman peaks near the energy levels of infrared (IR)-active $E_u$ and$A_{2u}$ modes, only for monolayer and a few-layers thick flakes.Interestingly, these peaks manifest themselves only for helicity-switched Ramanscattering; they are nearly absent for helicity-conserved scattering.

Helicity resolved Raman spectroscopy of mono- and a few-layers thick PtSe$_2$