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. 2019 Apr 12;364(6436):162-165.
doi: 10.1126/science.aau0685. Epub 2019 Feb 28.

Measuring Hall viscosity of graphene's electron fluid

A I Berdyugin  1 , S G Xu  1   2 , F M D Pellegrino  3   4 , R Krishna Kumar  1   2 , A Principi  1 , I Torre  5 , M Ben Shalom  1   2 , T Taniguchi  6 , K Watanabe  6 , I V Grigorieva  1 , M Polini  7   1 , A K Geim  8   2 , D A Bandurin  8
Affiliations

Measuring Hall viscosity of graphene's electron fluid

A I Berdyugin et al. Science. .

Abstract

An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence of current flow. Here, we report a qualitative deviation from the standard behavior in electron systems with high viscosity. We found that the viscous electron fluid in graphene responds to nonquantizing magnetic fields by producing an electric field opposite to that generated by the ordinary Hall effect. The viscous contribution is substantial and identified by studying local voltages that arise in the vicinity of current-injecting contacts. We analyzed the anomaly over a wide range of temperatures and carrier densities and extracted the Hall viscosity, a dissipationless transport coefficient that was long identified theoretically but remained elusive in experiments.

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