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/T2 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.
@article{arxiv.2405.09097,
title = {Temperature Dependence of Electron Viscosity in Superballistic GaAs Point Contacts},
author = {Daniil I. Sarypov and Dmitriy A. Pokhabov and Arthur G. Pogosov and Evgeny Yu. Zhdanov and Andrey A. Shevyrin and Askhat K. Bakarov and Alexander A. Shklyaev},
journal= {arXiv preprint arXiv:2405.09097},
year = {2025}
}