Seifert, Paul and Vaklinova, Kristina and Ganichev, Sergey and Kern, Klaus and Burghard, Marko and Holleitner, Alexander W. (2018) Spin Hall photoconductance in a three-dimensional topological insulator at room temperature. NATURE COMMUNICATIONS, 9: 331. ISSN 2041-1723,
Full text not available from this repository. (Request a copy)Abstract
Three-dimensional topological insulators are a class of Dirac materials, wherein strong spin-orbit coupling leads to two-dimensional surface states. The latter feature spin-momentum locking, i.e., each momentum vector is associated with a spin locked perpendicularly to it in the surface plane. While the principal spin generation capability of topological insulators is well established, comparatively little is known about the interaction of the spins with external stimuli like polarized light. We observe a helical, bias-dependent photoconductance at the lateral edges of topological Bi2Te2Se platelets for perpendicular incidence of light. The same edges exhibit also a finite bias-dependent Kerr angle, indicative of spin accumulation induced by a transversal spin Hall effect in the bulk states of the Bi2Te2Se platelets. A symmetry analysis shows that the helical photoconductance is distinct to common longitudinal photoconductance and photocurrent phenomena, but consistent with optically injected spins being transported in the side facets of the platelets.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRICAL DETECTION; SURFACE-STATE; PHOTOCURRENTS; POLARIZATION; GENERATION; CURRENTS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 19 Mar 2020 12:21 |
| Last Modified: | 19 Mar 2020 12:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15183 |
Actions (login required)
 |
View Item |
