Helicity resolved Raman spectroscopy of mono- and a few-layers thick PtSe2
Abstract
We studied helicity resolved Raman scattering in PtSe2 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 Eg mode, consistent with the Raman tensor analyses and conservation law of angular momentum. The peak amplitude of the helicity-switched Eg mode is larger for the thinner flakes. In addition, we find Raman peaks near the energy levels of infrared (IR)-active Eu and A2u 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.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.