Interplay of valley selection and helicity exchange of light in Raman scattering for graphene and MoS2

Yuki Tatsumi, Riichiro Saito

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Raman spectra of graphene and MoS2 are calculated for incident and scattered circularly polarized light. In the case of graphene, the well known G-band Raman spectra have a not well known property that the helicity of the incident circularly polarized light changes to another helicity in the scattered light. Using the electron-photon and electron-phonon matrix elements by first-principles calculation, we calculate resonant Raman spectra of graphene and MoS2 for circularly polarized light which are compared with recent experiments. The Raman intensity for circularly polarized light is relevant to optical valley polarization in the case of MoS2. We also discuss how the helicity-selection rule can be modified by applying stress to graphene.

Original languageEnglish
Article number115407
JournalPhysical Review B
Volume97
Issue number11
DOIs
Publication statusPublished - 2018 Mar 8

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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