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

Jhih Shih You, I. Kang Liu, Daw Wei Wang, Shih-Chuan Gou, Congjun Wu

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Article number053623
JournalPhysical Review A
Volume93
Issue number5
DOIs
Publication statusPublished - 2016 May 23

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bosons
condensation
orbitals
condensates
asymmetry
interactions
wave functions
vortices
propagation
symmetry
configurations

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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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.",
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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. / You, Jhih Shih; Liu, I. Kang; Wang, Daw Wei; Gou, Shih-Chuan; Wu, Congjun.

In: Physical Review A, Vol. 93, No. 5, 053623, 23.05.2016.

Research output: Contribution to journalArticle

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AU - You, Jhih Shih

AU - Liu, I. Kang

AU - Wang, Daw Wei

AU - Gou, Shih-Chuan

AU - Wu, Congjun

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