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Universal spin transport in a strongly interacting Fermi gas

Author

Listed:
  • Ariel Sommer

    (Massachusetts Institute of Technology
    MIT-Harvard Center for Ultracold Atoms, Massachusetts Institute of Technology
    Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Mark Ku

    (Massachusetts Institute of Technology
    MIT-Harvard Center for Ultracold Atoms, Massachusetts Institute of Technology
    Research Laboratory of Electronics, Massachusetts Institute of Technology)

  • Giacomo Roati

    (INO-CNR, University of Florence
    LENS, University of Florence)

  • Martin W. Zwierlein

    (Massachusetts Institute of Technology
    MIT-Harvard Center for Ultracold Atoms, Massachusetts Institute of Technology
    Research Laboratory of Electronics, Massachusetts Institute of Technology)

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.

Suggested Citation

  • Ariel Sommer & Mark Ku & Giacomo Roati & Martin W. Zwierlein, 2011. "Universal spin transport in a strongly interacting Fermi gas," Nature, Nature, vol. 472(7342), pages 201-204, April.
    • Handle: RePEc:nat:nature:v:472:y:2011:i:7342:d:10.1038_nature09989
    DOI: 10.1038/nature09989
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    Cited by:

    1. Oyama, T. & Nakamura, Y. & Yamanaka, Y., 2022. "4 × 4-matrix transformation for systems with spontaneous symmetry breakdown and self-consistent renormalization in nonequilibrium Thermo Field Dynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 591(C).
    2. Koki Ono & Toshiya Higomoto & Yugo Saito & Shun Uchino & Yusuke Nishida & Yoshiro Takahashi, 2021. "Observation of spin-space quantum transport induced by an atomic quantum point contact," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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