Predicted quantum stripe ordering in optical lattices

ORAL

Abstract

We predict the robust existence of a novel quantum orbital stripe order in the $p$- band Bose-Hubbard model of two-dimensional triangular optical lattices with cold bosonic atoms. An orbital angular momentum moment is formed on each site exhibiting a stripe order both in the superfluid and Mott-insulating phases. The stripe order spontaneously breaks time-reversal, lattice translation and rotation symmetries. In addition, it induces staggered plaquette bond currents in the superfluid phase. Possible signatures of this stripe order in the time of flight experiment are discussed.

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Authors

  • Congjun Wu

    Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA, University of California, Santa Barbara

  • W. Vincent Liu

    Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

  • Joel Moore

    UC Berkeley and LBNL, Department of Physics, University of California, Berkeley, California 94720, USA, UC Berkeley, UC Berkeley and Lawrence Berkeley National Laboratory, University of California, Berkeley

  • Sankar Das Sarma

    Condensed Matter Theory Center, Physics Department, University of Maryland, Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA, Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742, University of Maryland, Condensed Matter Theory Center, University of Maryland, College Park, MD 20742-4111, USA, University of Maryland, College Park, CMTC, Department of Physics, University of Maryland, College Park, MD 20742, CMTC, Department of Physics, UMD, Maryland, Condensed Matter Theory Center, University of Maryland