Shear viscosity and spin sum rules in strongly interacting Fermi gases
arXiv:1209.3317 · doi:10.1140/epjst/e2013-01765-7
Abstract
Fermi gases with short-range interactions are ubiquitous in ultracold atomic systems. In the absence of spin-flipping processes the number of atoms in each spin species is conserved separately, and we discuss the associated Ward identities. For contact interactions the spin conductivity spectral function sigma_s(omega) has universal power-law tails at high frequency. We derive the spin f-sum rule and show that it is not affected by these tails in d<4 dimensions. Likewise the shear viscosity spectral function eta(omega) has universal tails; in contrast they modify the viscosity sum rule in a characteristic way.
7 pages, published version
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Cited by in corpus (6)
- Universal Spin Transport and Quantum Bounds for Unitary Fermions
- Quantum critical thermal transport in the unitary Fermi gas
- Transverse spin diffusion in strongly interacting Fermi gases
- Optical spin transport theory of spin-1/2 topological Fermi superfluids
- Optical spin conductivity in ultracold quantum gases
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