Thermoelectric and viscous contributions to the hydrodynamic ratchet effect
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914798239744000 |
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| author | Potashin, S. O. Golub, L. E. Kachorovskii, V. Yu. |
| author_facet | Potashin, S. O. Golub, L. E. Kachorovskii, V. Yu. |
| contents | We study thermoelectric and viscous contributions to the ratchet effect, i.e. radiation-induced generation of the direct electric current, $J_{\rm rat},$ in asymmetric dual-grating gate structure without inversion center. Previously [E.Mönch et al, Phys. Rev. B {\bf 105}, 045404 (2022)], it was demonstrated that frequency dependence of the $J_{\rm rat}$ is essentially different within hydrodynamic (HD) and drift-diffusion (DD) regimes of the electron transport: $ J_{\rm rat}^{\rm HD} \propto 1/ω^6 $ and $ J_{\rm rat}^{\rm DD} \propto 1/ω^2 $ for $ω\to \infty.$ Here we analyze previously neglected thermoelectric contribution and find that it yields high-frequency asymptotic $1/ω^2$ even in the HD regime and can change sign of the response. Account of the finite viscosity of the electron liquid yields contribution which scales at high frequency as $1/ω^4.$ We also find plasmonic resonances in the $J_{\rm rat},$ and demonstrate that asymmetry of the structure allows for excitation of the so-called directional travelling plasmons. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_09668 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermoelectric and viscous contributions to the hydrodynamic ratchet effect Potashin, S. O. Golub, L. E. Kachorovskii, V. Yu. Mesoscale and Nanoscale Physics We study thermoelectric and viscous contributions to the ratchet effect, i.e. radiation-induced generation of the direct electric current, $J_{\rm rat},$ in asymmetric dual-grating gate structure without inversion center. Previously [E.Mönch et al, Phys. Rev. B {\bf 105}, 045404 (2022)], it was demonstrated that frequency dependence of the $J_{\rm rat}$ is essentially different within hydrodynamic (HD) and drift-diffusion (DD) regimes of the electron transport: $ J_{\rm rat}^{\rm HD} \propto 1/ω^6 $ and $ J_{\rm rat}^{\rm DD} \propto 1/ω^2 $ for $ω\to \infty.$ Here we analyze previously neglected thermoelectric contribution and find that it yields high-frequency asymptotic $1/ω^2$ even in the HD regime and can change sign of the response. Account of the finite viscosity of the electron liquid yields contribution which scales at high frequency as $1/ω^4.$ We also find plasmonic resonances in the $J_{\rm rat},$ and demonstrate that asymmetry of the structure allows for excitation of the so-called directional travelling plasmons. |
| title | Thermoelectric and viscous contributions to the hydrodynamic ratchet effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.09668 |