2024-03-29T10:04:58Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00022747
2023-01-16T04:11:52Z
320:321:322
Spin and charge transport induced by a twisted light beam on the surface of a topological insulator
Shintani, Kunitaka
Taguchi, Katsuhisa
Tanaka, Yukio
Kawaguchi, Yuki
open access
©2016 American Physical Society
We theoretically study spin and charge transport induced by a twisted light beam irradiated on a disordered surface of a doped three-dimensional topological insulator (TI). We find that various types of spin vortices are imprinted on the surface of the TI depending on the spin and orbital angular momentum of the incident light. The key mechanism for the appearance of the unconventional spin structure is the spin-momentum locking in the surface state of the TI. Besides, the diffusive transport of electrons under an inhomogeneous electric field causes a gradient of the charge density, which then induces nonlocal charge current and spin density as well as the spin current. We discuss the relation between these quantities within the linear response to the applied electric field using the Keldysh-Green's function method.
American Physical Society
2016-05
eng
journal article
VoR
http://hdl.handle.net/2237/24903
https://nagoya.repo.nii.ac.jp/records/22747
https://doi.org/10.1103/PhysRevB.93.195415
2469-9950
Physical Review B
93
195415
195415
https://nagoya.repo.nii.ac.jp/record/22747/files/PhysRevB_93_195415.pdf
application/pdf
2.4 MB
2018-02-22