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Chiral magnetism and spontaneous spin Hall effect of interacting Bose superfluids

Author

Listed:
  • Xiaopeng Li

    (Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland)

  • Stefan S. Natu

    (Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland)

  • Arun Paramekanti

    (University of Toronto
    Canadian Institute for Advanced Research)

  • S. Das Sarma

    (Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland)

Abstract

Recent experiments on ultracold atoms in optical lattices have synthesized a variety of tunable bands with degenerate double-well structures in momentum space. Such degeneracies in the single-particle spectrum strongly enhance quantum fluctuations, and often lead to exotic many-body ground states. Here we consider weakly interacting spinor Bose gases in such bands, and discover a universal quantum ‘order by disorder’ phenomenon which selects a novel superfluid with chiral spin order displaying remarkable properties such as spontaneous spin Hall effect and momentum space antiferromagnetism. For bosons in the excited Dirac band of a hexagonal lattice, such a state supports staggered spin loop currents in real space. We show that Bloch oscillations provide a powerful dynamical route to quantum state preparation of such a chiral spin superfluid. Our predictions can be readily tested in spin-resolved time-of-flight experiments.

Suggested Citation

  • Xiaopeng Li & Stefan S. Natu & Arun Paramekanti & S. Das Sarma, 2014. "Chiral magnetism and spontaneous spin Hall effect of interacting Bose superfluids," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6174
    DOI: 10.1038/ncomms6174
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