Mönch, E. and Potashin, S. O. and Lindner, K. and Yahniuk, I and Golub, L. E. and Kachorovskii, V. Yu and Bel'kov, V. V. and Huber, R. and Watanabe, K. and Taniguchi, T. and Eroms, J. and Weiss, D. and Ganichev, S. D. (2022) Ratchet effect in spatially modulated bilayer graphene: Signature of hydrodynamic transport. PHYSICAL REVIEW B, 105 (4): 045404. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We report on the observation of the ratchet effect-generation of direct electric current in response to external terahertz radiation-in bilayer graphene, where inversion symmetry is broken by an asymmetric dual-grating gate potential. As a central result, we demonstrate that at high temperature, T = 150 K, the ratchet current decreases at high frequencies as proportional to 1/omega 2, while at low temperature, T = 4.2 K, the frequency dependence becomes much stronger proportional to 1/omega 6. The developed theory shows that the frequency dependence of the ratchet current is very sensitive to the ratio of the electron-impurity and electron-electron scattering rates. The theory predicts that the dependence 1/omega 6 is realized in the hydrodynamic regime, when electron-electron scattering dominates, while 1/omega 2 is specific for the drift-diffusion approximation. Therefore, our experimental observation of a very strong frequency dependence reveals the emergence of the hydrodynamic regime.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BROWNIAN MOTORS; TERAHERTZ RADIATION; ELECTRON FLOW; FLUID |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Jonathan Eroms |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Feb 2024 05:58 |
| Last Modified: | 15 Feb 2024 05:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57543 |
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