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

Abstract

We studied helicity resolved Raman scattering in PtSe${}_2$ flakes with different thicknesses. The peak amplitude of helicity-switched Raman scattering is significantly larger than that of helicity-conserved scattering for the in-plane $E_g$ mode, consistent with the Raman tensor analyses and conservation law of angular momentum. The peak amplitude of the helicity-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 Raman scattering; they are nearly absent for helicity-conserved scattering.

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• The Raman Fingerprint of Graphene
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• Spin Seebeck insulator
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