Theory of the inverse Faraday effect due to the Rashba spin-oribt interactions: Roles of band dispersions and Fermi surfaces

Yasuhiro Tanaka, Takashi Inoue, Masahito Mochizuki*

*この研究の対応する著者

研究成果: Article査読

3 被引用数 (Scopus)

抄録

We theoretically study the inverse Faraday effect, i.e., the optical induction of spin polarization with circularly polarized light, by particularly focusing on effects of band dispersions and Fermi surfaces in crystal systems with the spin-orbit interaction (SOI). By numerically solving the time-dependent Schrödinger equation of a tight-binding model with the Rashba-type SOI, we reproduce the light-induced spin polarization proportional to where E 0 and ω are the electric-field amplitude and the angular frequency of light, respectively. This optical spin induction is attributed to dynamical magnetoelectric coupling between the light electric field and the electron spins mediated by the SOI. We elucidate that the magnitude and sign of the induced spin polarization sensitively depend on the electron filling. To understand these results, we construct an analytical theory based on the Floquet theorem. The theory successfully explains the dependencies on E 0 and ω and ascribes the electron-filling dependence to a momentum-dependent effective magnetic field governed by the Fermi-surface geometry. Several candidate materials and experimental conditions relevant to our theory and model parameters are also discussed. Our findings will enable us to engineer the magneto-optical responses of matters via tuning the material parameters.

本文言語English
論文番号083054
ジャーナルNew Journal of Physics
22
8
DOI
出版ステータスPublished - 2020 8月

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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