TY - JOUR
T1 - Conservation law of angular momentum in helicity-dependent Raman and Rayleigh scattering
AU - Tatsumi, Yuki
AU - Kaneko, Tomoaki
AU - Saito, Riichiro
N1 - Funding Information:
Y.T. thanks Dr. W. Izumida for helpful discussions. Y.T. acknowledges the World Premier International Research Center Initiative (WPI), MEXT, Japan. T.K. and R.S. acknowledge JSPS KAKENHI Grants No. JP25107001, No. JP25107005, No. JP25286005, and No. JP18H01810.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/5/29
Y1 - 2018/5/29
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.97.195444
DO - 10.1103/PhysRevB.97.195444
M3 - Article
AN - SCOPUS:85048245665
VL - 97
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 19
M1 - 195444
ER -