Danilov, S. N. and Golub, L. E. and Mayer, T. and Beer, A. and Binder, S. and Mönch, E. and Minar, J. and Kronseder, M. and Back, C. H. and Bougeard, D. and Ganichev, S. D. (2021) Superlinear Photogalvanic Effects in (Bi0.3Sb0.7)2(Te0.1Se0.9)(3): Probing Three-Dimensional Topological Insulator Surface States at Room Temperature. PHYSICAL REVIEW APPLIED, 21 (6): 064030. ISSN 2331-7019
Full text not available from this repository. (Request a copy)Abstract
We report on the observation of a complex nonlinear intensity dependence of the circular and linear photogalvanic currents induced by infrared radiation in compensated (Bi0.3Sb0.7)(2) (Te0.1Se0.9)(3) three-dimensional topological insulators. The photocurrents are induced by direct optical transitions between topological surface and bulk states. We show that an increase in the radiation intensity results first in a highly superlinear rise in the amplitude of both types of photocurrents, whereas at higher intensities the photocurrent saturates. Our analysis of the observed nonlinearities shows that the superlinear behavior of the photocurrents is caused by heating of the electron gas, while the saturation is induced by slow relaxation of the photoexcited carriers, resulting in absorbance bleaching. The observed nonlinearities give access to the Fermi-level position with respect to the Dirac point and the energy relaxation times of Dirac fermions, providing an experimental room-temperature probe of topological surface states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPIN PHOTOCURRENTS; DEEP IMPURITIES; SPECTROSCOPY; IONIZATION; BI2SE3; BI2TE3 |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Chair Professor Back > Group Christian Back Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Jul 2022 05:42 |
| Last Modified: | 05 Jul 2022 05:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/46855 |
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