Unconventional superfluidity with non-collinear orbital order

ORAL

Abstract

We propose an unconventional superfluid with spontaneous time-reversal symmetry breaking in p-orbital bands of cubic optical lattices. We find that in contrast to the square lattice which exhibits an antiferromagnetic orbital angular momentum (OAM), quantum fluctuations in the cubic lattice select an exotic superfluid state with non-collinear orderings of OAM moments. The collective excitations and phase transitions in this unconventional superfluid have also been discussed. This exotic superfluid state has no counterpart in solid state systems.

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Authors

  • Hubert Nguyen

    • UC San Diego

  • Zi Cai

    • The department of Physics, Univeristy of California, San Diego
    • UC San Diego
    • The Department of Physics, University of California, San Diego

  • Congjun Wu

    • The department of Physics, Univeristy of California, San Diego
    • The Department of Physics, Univeristy of California, San Diego
    • The Department of Physics, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • UC San Diego
    • The Department of Physics, University of Science and Technology of China
    • University of California, San Diego