Viscous transport and Hall viscosity in a two-dimensional electron system

TL;DR

This paper reports the experimental observation of Hall viscosity in a 2D electron system, demonstrating its influence on viscous flow and confirming theoretical predictions about its conditions of appearance.

Contribution

First experimental detection of Hall viscosity effects in a mesoscopic 2D electron system, linking inhomogeneous charge flow with theoretical models.

Findings

Negative Hall resistivity observed at low magnetic fields

Hall viscosity influences viscous flow in 2D electron systems

Experimental results align with theoretical predictions

Abstract

Hall viscosity is a nondissipative response function describing momentum transport in two-dimensional (2D) systems with broken time-reversal symmetry. In the classical regime, Hall viscosity contributes to the viscous flow of 2D electrons in the presence of a magnetic field. We observe a pronounced, negative Hall resistivity at low magnetic field in a mesoscopic size, two-dimensional electron system, which is attributed to Hall viscosity in the inhomogeneous charge flow. Experimental results supported by a theoretical analysis confirm that the conditions for observation of Hall viscosity are correlated with predictions.