Corbino magnetoresistance in neutral graphene

TL;DR

This paper investigates how viscosity influences magnetoresistance in neutral graphene within a Corbino setup, providing a method to measure viscosity through magnetoresistance experiments.

Contribution

It offers a comprehensive hydrodynamic model for neutral graphene in Corbino geometry, incorporating all relevant scattering and dissipation mechanisms.

Findings

Magnetoresistance in clean graphene is primarily governed by viscosity.

Corbino geometry can be used to measure the viscosity coefficient.

The study accounts for all graphene-specific hydrodynamic effects.

Abstract

We explore the magnetohydrodynamics of Dirac fermions in neutral graphene in the Corbino geometry. Based on the fully consistent hydrodynamic description derived from a microscopic framework and taking into account all peculiarities of graphene-specific hydrodynamics, we report the results of a comprehensive study of the interplay of viscosity, disorder-induced scattering, recombination, energy relaxation, and interface-induced dissipation. In the clean limit, magnetoresistance of a Corbino sample is determined by viscosity. Hence the Corbino geometry could be used to measure the viscosity coefficient in neutral graphene.