Universal spin transport in a strongly interacting Fermi gas

Ariel Sommer (), Mark Ku, Giacomo Roati and Martin W. Zwierlein
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Ariel Sommer: Massachusetts Institute of Technology
Mark Ku: Massachusetts Institute of Technology
Giacomo Roati: INO-CNR, University of Florence
Martin W. Zwierlein: Massachusetts Institute of Technology

Nature, 2011, vol. 472, issue 7342, 201-204

Abstract: Atomic spin currents in Fermi gases Strongly interacting Fermi gases are ubiquitous in nature, from electrons in high-temperature superconductors, to nuclear matter. Their transport properties, such as the speed of diffusion, are poorly understood. Sommer et al. use controlled collisions of ultracold atomic clouds to investigate spin transport in a strongly interacting Fermi gas. They find that the spin excitations are maximally damped (leading to high spin drag), and that interactions are strong enough to reverse spin currents so that opposite spin components reflect off each other. The speed of diffusion is set by a fundamental quantum limit. The results have implications for any area involving fermion transport, from spintronics to studies of the early Universe.

Date: 2011
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DOI: 10.1038/nature09989

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