Olbrich, P. and Zoth, C. and Vierling, P. and Dantscher, K. -M. and Budkin, G. V. and Tarasenko, S. A. and Bel'kov, V. V. and Kozlov, D. A. and Kvon, Z. D. and Mikhailov, N. N. and Dvoretsky, S. A. and Ganichev, S. D. (2013) Giant photocurrents in a Dirac fermion system at cyclotron resonance. PHYSICAL REVIEW B, 87 (23): 235439. ISSN 1098-0121,
Full text not available from this repository.Abstract
We report on the observation of the giant photocurrents in HgTe/HgCdTe quantum well (QW) of critical thickness at which a Dirac spectrum emerges. At an exciting QW of 6.6 nm width by terahertz (THz) radiation and sweeping magnetic field we detected a resonant photocurrent. Remarkably, the position of the resonance can be tuned from negative (-0.4 T) to positive (up to 1.2 T) magnetic fields by means of optical doping. The photocurrent data, accompanied by measurements of radiation transmission as well as Shubnikov-de Haas and quantum Hall effects, prove that the photocurrent is caused by cyclotron resonance in a Dirac fermion system, which allows us to obtain the effective electron velocity v approximate to 7.2 x 10(5) m/s. We develop a microscopic theory of the effect and show that the inherent spin-dependent asymmetry of light-matter coupling in the system of Dirac fermions causes the electric current to flow.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HGTE QUANTUM-WELLS; 2-DIMENSIONAL ELECTRON-SYSTEMS; TOPOLOGICAL INSULATOR; SPIN RELAXATION; HETEROSTRUCTURES; TRANSPORT; GRAPHENE; STATE; PHASE; HOLES; |
| 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: | 07 Apr 2020 11:01 |
| Last Modified: | 07 Apr 2020 11:01 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16487 |
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