Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Ryotaro Sano, Daigo Oue, Mamoru Matsuo, ,
| Summary:
Recent experiments have revealed that novel nonequilibrium states consistent
with the hydrodynamic description of electrons are realized in ultrapure
graphene, which hosts the valley degrees of freedom. Here, we formulate a
theory of electron hydrodynamics including dissipation processes of the valley
angular momentum by employing the concept of micropolar fluids. As a result,
our theory proposes a novel strategy to generate a valley polarization by the
microrotation. We uncover that the rotational viscosity induces longitudinal
valley currents which are second order in electric fields.
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