Hydrodynamics of nonintegrable systems from a relaxation-time approximation
arXiv:2005.13546 · doi:10.1103/PhysRevB.103.L060302
Abstract
We develop a general kinetic theory framework to describe the hydrodynamics of strongly interacting, nonequilibrium quantum systems in which integrability is weakly broken, leaving a few residual conserved quantities. This framework is based on a generalized relaxation-time approximation; it gives a simple, but surprisingly accurate, prescription for computing nonequilibrium transport even in strongly interacting systems. This approximation reproduces the crossover from generalized to conventional hydrodynamics in interacting one-dimensional Bose gases with integrability-breaking perturbations, both with and without momentum conservation. It also predicts the hydrodynamics of chaotic quantum spin chains, in good agreement with matrix product operator calculations.
arXiv commentv1: 4+4 pages; v2: added 2 new figures; v3: included results for new integrability-breaking perturbation. As published
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