We report non-local electrical measurements in a mesoscopic size two-dimensional (2D) electron gas in a GaAs quantum well in a hydrodynamic regime. Viscous electric flow is expected to be dominant when electron-electron collisions occur more often than the impurity or phonon scattering events. We observe a negative nonlocal resistance and attribute it to the formation of whirlpools in the electron flow. We use the different nonlocal transport geometries and compare the results with a theory demonstrating the significance of hydrodynamics in mesoscopic samples.
@article{arxiv.1810.06515,
title = {Vorticity induced negative nonlocal resistance in viscous two-dimensional electron system},
author = {A. D. Levin and G. M. Gusev and E. V. Levinson and Z. D. Kvon and A. K. Bakarov},
journal= {arXiv preprint arXiv:1810.06515},
year = {2018}
}