Conservation law of angular momentum in helicity-dependent Raman and Rayleigh scattering

Yuki Tatsumi, Tomoaki Kaneko, Riichiro Saito

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In first-order Raman scattering, helicity of circularly polarized incident light is either conserved or changed depending on the Raman modes. When the helicity of incident light changes in the scattered light, the angular momentum of a photon is transferred to the material. Here, we present the conservation law of pseudoangular momentum in the helicity-dependent Raman scattering for a N-fold (N=1-4,6) rotational symmetry of a crystal. Furthermore, the conservation law of electron-phonon interaction is discussed by considering the vibration direction of a phonon that has the same or lower symmetry than the symmetry of the crystal, which is essential to allow the helicity change in Raman scattering in a highly symmetric material, such as graphene. We also discuss the conservation law of pseudoangular momentum in Rayleigh scattering and show that the helicity change is allowed only in the crystal with one- or twofold rotational symmetry.

Original languageEnglish
Article number195444
JournalPhysical Review B
Volume97
Issue number19
DOIs
Publication statusPublished - 2018 May 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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