Hall viscosity in quantum systems with discrete symmetry: point group and lattice anisotropy
arXiv:1910.10727 · doi:10.1103/PhysRevX.10.021005
Abstract
Inspired by recent experiments on graphene, we examine the non-dissipative viscoelastic response of anisotropic two-dimensional quantum systems. We pay particular attention to electron fluids with point group symmetries, and those with discrete translational symmetry. We start by extending the Kubo formalism for viscosity to systems with internal degrees of freedom and discrete translational symmetry, highlighting the importance of properly considering the role of internal angular momentum. We analyze the Hall components of the viscoelastic response tensor in systems with discrete point group symmetry, focusing on the hydrodynamic implications of the resulting forces. We show that though there are generally six Hall viscosities, there are only three independent contributions to the viscous force density in the bulk. To compute these coefficients, we develop a framework to consistently write down the long-wavelength stress tensor and viscosity for multi-component lattice systems. We apply our formalism to lattice and continuum models, including a lattice Chern insulator and anisotropic superfluid.
arXiv commentv2. Accepted version. Now 32 pages, 6 figures. Added sections discussing the viscosity-conductivity relation, external magnetic fields, and experimental implications. Expanded discussion of independent dissipative and nondissipative viscous forces. v1. 26 pages plus references, 6 figures
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