Condensed Matter Seminar

Out-of-bounds Hydrodynamics in anisotropic Dirac fluids

Wed, 19 Sep 2018 2:30 PM
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Condensed Matter Seminar
Out-of-bounds Hydrodynamics in anisotropic Dirac fluids

Julia Link
Department of Physics, SFU

Sept 19, 2018 at 2:30PM in P8445.2

Synopsis

We study hydrodynamic transport in two-dimensional, interacting electronic systems with merging Dirac points at charge neutrality. The dispersion along one crystallographic direction is Dirac-like, while it is Newtonian-like in the orthogonal direction. As a result, the electrical conductivity is metallic in one and insulating in the other direction. The shear viscosity tensor contains six independent components, which can be probed by measuring an anisotropic thermal flow. One of the viscosity components vanishes at zero temperature leading to a generalization of the previously conjectured lower bound for the shear viscosity to entropy density ratio.