The nonzero bulk viscosity signals breaking of the scale invariance. We demonstrate that a disorder in two-dimensional noninteracting electron gas in a perpendicular magnetic field results in the nonzero disorder-averaged bulk viscosity. We derive analytic expression for the bulk viscosity within the self-consistent Born approximation. This residual bulk viscosity provides the lower bound for the bulk viscosity of 2D interacting electrons at low enough temperatures.
@article{arxiv.2102.10533,
title = {Residual bulk viscosity of a disordered 2D electron gas},
author = {V. A. Zakharov and I. S. Burmistrov},
journal= {arXiv preprint arXiv:2102.10533},
year = {2021}
}