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Universal Spin Transport and Quantum Bounds for Unitary Fermions

Authors
  • Enss, Tilman
  • Thywissen, Joseph H.
Type
Published Article
Journal
Annual Review of Condensed Matter Physics
Publisher
Annual Reviews
Publication Date
Mar 10, 2019
Volume
10
Pages
85–106
Identifiers
DOI: 10.1146/annurev-conmatphys-031218-013732
Source
Annual Reviews
Keywords
License
Yellow

Abstract

We review recent advances in experimental and theoretical understanding of spin transport in strongly interacting Fermi gases. The central new phenomenon is the observation of a lower bound on the (bare) spin diffusivity in the strongly interacting regime. Transport bounds are of broad interest for the condensed matter community, with a conceptual similarity to observed bounds in shear viscosity and charge conductivity. We discuss the formalism of spin hydrodynamics, how dynamics are parameterized by transport coefficients, the effect of confinement, the role of scale invariance, the quasiparticle picture, and quantum critical transport. We conclude by highlighting open questions, such as precise theoretical bounds, relevance to other phases of matter, and extensions to lattice systems.

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