Sai, P. and Potashin, S. O. and Szola, M. and Yavorskiy, D. and Cywinski, G. and Prystawko, P. and Lusakowski, J. and Ganichev, S. D. and Rumyantsev, S. and Knap, W. and Kachorovskii, V. Yu (2021) Beatings of ratchet current magneto-oscillations in GaN-based grating gate structures: Manifestation of spin-orbit band splitting. PHYSICAL REVIEW B, 104 (4): 045301. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We report on the study of the magnetic ratchet effect in AlGaN/GaN heterostructures superimposed with a lateral superlattice formed by a dual-grating gate structure. We demonstrate that irradiation of the superlattice with a terahertz beam results in the direct ratchet current, which shows giant magneto-oscillations in the regime of Shubnikov-de Haas oscillations. The oscillations have the same period and are in phase with the resistivity oscillations. Remarkably, their amplitude is greatly enhanced as compared with the ratchet current at zero magnetic field, and the envelope of these oscillations exhibits large beatings as a function of the magnetic field. We demonstrate that the beatings are caused by the spin-orbit (SO) splitting of the conduction band. We develop a theory which gives a good qualitative explanation of all experimental observations and allows us to extract the SO splitting constant alpha(SO) = 7.5 +/- 1.5 meV angstrom. We also discuss how our results are modified by plasmonic effects and show that these effects become more pronounced with decreasing the period of the grating gate structures down to submicrons.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2-DIMENSIONAL ELECTRON-GAS; TERAHERTZ DETECTION; BROWNIAN MOTORS; PLASMONICS; TRANSPORT; GRAPHENE |
| 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: | 13 Sep 2022 07:41 |
| Last Modified: | 13 Sep 2022 07:41 |
| URI: | https://pred.uni-regensburg.de/id/eprint/47845 |
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