Temperature Dependence of Electron Viscosity in Superballistic GaAs Point Contacts
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arXiv
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| Format: | Preprint |
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2024
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| author | Sarypov, Daniil I. Pokhabov, Dmitriy A. Pogosov, Arthur G. Zhdanov, Evgeny Yu. Shevyrin, Andrey A. Bakarov, Askhat K. Shklyaev, Alexander A. |
| author_facet | Sarypov, Daniil I. Pokhabov, Dmitriy A. Pogosov, Arthur G. Zhdanov, Evgeny Yu. Shevyrin, Andrey A. Bakarov, Askhat K. Shklyaev, Alexander A. |
| contents | Electron transport in suspended and non-suspended GaAs point contacts (PCs) of different widths is experimentally studied. The superballistic contribution to the conductance, that demonstrates a distinctive quadratic dependence on the PC width and temperature growth, is extracted from the experiment. The studied PCs are shown to be described in the framework of hydrodynamic electron flow a in wide temperature range. At low temperatures, $T$, the viscosity is found out to obey the law $1/T^2$ expected for 2D systems, while at higher temperatures it has the dependence $1/T$. Similar measurements performed after the suspension of PCs, i.e. their separation from substrate, show that the electron viscosity reduces in the whole temperature range, that indicates an enhanced electron-electron interaction in suspended structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_09097 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Temperature Dependence of Electron Viscosity in Superballistic GaAs Point Contacts Sarypov, Daniil I. Pokhabov, Dmitriy A. Pogosov, Arthur G. Zhdanov, Evgeny Yu. Shevyrin, Andrey A. Bakarov, Askhat K. Shklyaev, Alexander A. Mesoscale and Nanoscale Physics Electron transport in suspended and non-suspended GaAs point contacts (PCs) of different widths is experimentally studied. The superballistic contribution to the conductance, that demonstrates a distinctive quadratic dependence on the PC width and temperature growth, is extracted from the experiment. The studied PCs are shown to be described in the framework of hydrodynamic electron flow a in wide temperature range. At low temperatures, $T$, the viscosity is found out to obey the law $1/T^2$ expected for 2D systems, while at higher temperatures it has the dependence $1/T$. Similar measurements performed after the suspension of PCs, i.e. their separation from substrate, show that the electron viscosity reduces in the whole temperature range, that indicates an enhanced electron-electron interaction in suspended structures. |
| title | Temperature Dependence of Electron Viscosity in Superballistic GaAs Point Contacts |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.09097 |