Inter-band coupling induced novel condensates in a double-well lattice

ORAL

Abstract

We predict novel inter-band physics for bosons in a double-well lattice. An intrinsic coupling between the s and px band due to interaction gives rise to larger Mott regions on the phase diagram at even fillings than the ones at odd fillings. On the other hand, the ground state can form various types of condensates, including a mixture of single-particle condensates of both bands, a mixture of a single-particle condensate of one band and a pair-condensate of the other band, and a pair-condensate composed of one particle from one band and one hole from the other band. The predicted phenomena should be observable in current experiments on double-well optical lattices.

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Authors

  • Qi Zhou

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

  • James V. Porto

    Joint Quantum Institute, University of Maryland

  • Sankar Das Sarma

    Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742, Condensed Matter Theory Center, Department of Physics, University of Maryland, Univ of Maryland-College Park, Condensed Matter Theory Center, Dept. of Physics, University of Maryland, College Park, MD, CMTC, Dept of Physics, University of Maryland, College Park, Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA, Condensed Matter Theory Center, University of Maryland, College Park, Dep. of Physics, Condensed Matter Theory Center, University of Maryland, College Park, Maryland, University of Maryland, JQI and CMTC, University of Maryland, Joint Quantum Institute and Condensed Matter Theory Center, University of Maryland