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Universal Spin Transport and Quantum Bounds for Unitary Fermions
- Tilman Enss1, and Joseph H. Thywissen2,3
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View Affiliations Hide AffiliationsAffiliations: 1Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg, Germany; email: [email protected] 2Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada; email: [email protected] 3Canadian Institute for Advanced Research, Toronto, Ontario M5G 1M1, Canada
- Vol. 10:85-106 (Volume publication date March 2019) https://doi.org/10.1146/annurev-conmatphys-031218-013732
- First published as a Review in Advance on November 28, 2018
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Copyright © 2019 by Annual Reviews. All rights reserved
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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