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Unconventional Bose-Einstein condensation in a system with two species of bosons in the p-orbital bands in an optical lattice

Lookup NU author(s): Dr Gary LiuORCiD

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This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2016.

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Abstract

In the context of Gross-Pitaevskii theory, we investigate the unconventional Bose-Einstein condensations in the two-species mixture with p-wave symmetry in the second band of a bipartite optical lattice. An imaginary-time propagation method is developed to numerically determine the p-orbital condensation. Different from the single-species case, the two-species boson mixture exhibits two nonequivalent complex condensates in the intraspecies-interaction-dominating regime, exhibiting the vortex-antivortex lattice configuration in the charge and spin channels, respectively. When the interspecies interaction is tuned across the SU(2) invariant point, the system undergoes a quantum phase transition toward a checkerboardlike spin-density wave state with a real-valued condensate wave function. The influence of lattice asymmetry on the quantum phase transition is addressed. Finally, we present a phase-sensitive measurement scheme for experimentally detecting the unconventional Bose-Einstein condensation in our model.

Publication metadata

Author(s): You JS, Liu IK, Wang DW, Gou SC, Wu C

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2016

Volume: 93

Pages:

Online publication date: 23/05/2016

Acceptance date: 08/09/2015

Date deposited: 18/03/2020

ISSN (print): 2469-9926

ISSN (electronic): 2469-9934

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevA.93.053623

DOI: 10.1103/PhysRevA.93.053623

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