Abnormal nonlinear optical responses on the surface of topological materials
Name
s41524-022-00782-y.pdf
Description
Published version
Size
1.52 MB
Format
Adobe PDF
Checksum (MD5)
a4d45e2f5e681d6b5ec0c689ed3ab131
Author(s)
Xu, Haowei
Wang, Hua
Li, Ju
Date Issued
December 2022
Journal
npj Computational Materials
Publisher
Springer Science and Business Media LLC
Citation
Xu, Haowei, Wang, Hua and Li, Ju. 2022. "Abnormal nonlinear optical responses on the surface of topological materials." npj Computational Materials, 8 (1).
Version
Final published version
Abstract
AbstractThe nonlinear optical (NLO) responses of topological materials are under active research. Most previous works studied the surface and bulk NLO responses separately. Here we develop a generic Green’s function framework to investigate the surface and bulk NLO responses together. We reveal that the topological surface can behave disparately from the bulk under light illumination. Remarkably, the photocurrents on the surface can flow in opposite directions to those in the bulk interior, and the light-induced spin current on the surface can be orders of magnitude stronger than its bulk counterpart on a per-volume basis. We also study the responses under inhomogeneous field and higher-order NLO effect, which are all distinct on the surface. These anomalous surface responses suggest that light can be a valuable tool for probing the surface states of topological materials. Besides, the surface effects should be prudently considered when investigating the optical properties of topological materials.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41524-022-00782-y
