Potashin, S. O. and Golub, L. E. and Kachorovskii, V. Yu. (2025) Thermoelectric and viscous contributions to the hydrodynamic ratchet effect. PHYSICAL REVIEW B, 111 (20): 205401. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We study the hydrodynamic regime of the ratchet effect, i.e., radiation-induced generation of a direct electric current Jrat, in an asymmetric dual-grating gate structure without an inversion center. Recently, it was demonstrated that the frequency dependence of Jrat is essentially different within the hydrodynamic (HD) and drift-diffusion (DD) regimes of electron transport: JratHD cx 1/w6 and JratDD cx 1/w2 for w-* oc. Here, we analyze the previously neglected thermoelectric contribution to the ratchet current Jth, which arises due to inhomogeneous heating of the electron liquid. We demonstrate that this contribution dominates at sufficiently low electron-phonon scattering rates, yields a high-frequency asymptotic Jth cx 1/w2 even in the HD regime, and can change the sign of the response at certain frequency intervals. We analyze the plasmonic resonance in Jrat, which has the shape of an asymmetric Fano peak, and find that the asymmetry increases with increasing thermoelectric contribution. We also study the effect of finite viscosity of the electron liquid, as well as the manifestation of the plasmonic drag phenomena and inhomogeneous rectification effects in the ratchet current. We demonstrate that viscosity suppresses plasmonic resonance but unexpectedly enhances the Drude peak due to the interference nature of the ratchet effect.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BROWNIAN MOTORS; ELECTRON FLOW; TRANSPORT; RESISTANCE |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 08:44 |
| Last Modified: | 15 Jul 2026 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66611 |
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