Unconventional Bose-Einstein Condensations of Two-species Bosons in the $p$-orbital Bands in Optical Lattice

ORAL

Abstract

We investigate the unconventional Bose-Einstein condensations of two-species mixture with $p$-wave symmetry in the second band of a bipartite optical lattice. Different from the single-species case, the two-species boson mixture exhibits two non-equivalent complex BECs in the intraspecies-interaction-dominating regime, with one breaking time-reversal symmetry while the other not. When the interspecies interaction is tuned across the SU(2) invariant point, the system undergoes a quantum phase transition toward a real-valued checkerboard state characterized by a staggered spin density structure. An experimental scheme for phase measurement is presented. Finally, we will show strong coupling analysis on anti-Hund'srule, Mott-insulating states and the superfluid.

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Authors

  • Jhih-Shih You

    • Department of Physics, Harvard University

  • I-Kang Liu

    • Department of Physics and Graduate Institute of Photonics, National Changhua University of Education

  • Daw-Wei Wang

    • Physics Department and Physics division, National Center for Theoretical Sciences, National Tsing-Hua University

  • Shih-Chuan Gou

    • Department of Physics and Graduate Institute of Photonics, National Changhua University of Education

  • Congjun Wu

    • Department of Physics, University of California, San Diego