Symmetry-enriched Bose-Einstein condensates in a spin-orbit-coupled bilayer system

Jia-Ming Cheng, Xiang-Fa Zhou, Zheng-Wei Zhou, Guang-Can Guo, and Ming Gong
Phys. Rev. A 97, 013625 – Published 22 January 2018

Abstract

We consider the fate of Bose-Einstein condensation with time-reversal symmetry and inversion symmetry in a spin-orbit-coupled bilayer system. When these two symmetry operators commute, all the single-particle bands are exactly twofold degenerate in the momentum space. The scattering in the twofold-degenerate rings can relax the spin-momentum locking effect from spin-orbit-coupling interaction and thus can realize the spin-polarized plane-wave phase even when the interparticle interaction dominates. When these two operators anticommute, the lowest two bands may have the same minimal energy, but with totally different spin structures. As a result, the competition between different condensates in these two energetically degenerate rings can give rise to different stripe phases with atoms condensed at two or four collinear momenta. We find that the crossover between these two cases is accompanied by the excited band condensation when the interference energy can overcome the increased single-particle energy in the excited band. This effect is not based on strong interaction and thus can be realized even with moderate interaction strength.

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  • Received 4 July 2017

DOI:https://doi.org/10.1103/PhysRevA.97.013625

©2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Jia-Ming Cheng1, Xiang-Fa Zhou1,2, Zheng-Wei Zhou1,2,*, Guang-Can Guo1,2, and Ming Gong1,2,†

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, People's Republic of China
  • 2Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China

  • *zwzhou@ustc.edu.cn
  • gongm@ustc.edu.cn

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Vol. 97, Iss. 1 — January 2018

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