Unconventional Bose-Einstein condensation in high orbital bands

ORAL

Abstract

We perform the theoretical study on unconventional Bose-Einstein condensations (UBEC) in higher orbital bands of optical lattices observed by Hemmerich's group. These exotic states of bosons are non-zero condensation wavevectors, and thus beyond the ``no-node'' paradigm. We have studied various effects on UBECs including lattice asymmetry and interactions. The interplay between the kinetic and interaction energies gives rise to two different UBECs with the real and complex-valued condensation wavefunctions, respectively. The latter spontaneously breaks time-reversal symmetry, which is impossible in usual BEC systems.

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Authors

  • 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

  • Zi Cai

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

  • Andreas Hemmerich

    Institut f\"ur Laser-Physik, Universit\"at Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany