Bose-Einstein condensates under a non-Hermitian spin-orbit coupling

doi:10.1088/1674-1056/abd7e4

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 66702-066702.doi: 10.1088/1674-1056/abd7e4

Bose-Einstein condensates under a non-Hermitian spin-orbit coupling

Hao-Wei Li(李浩伟)^† and Jia-Zheng Sun(孙佳政)

CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

收稿日期:2020-10-19 修回日期:2020-12-11 接受日期:2021-01-04 出版日期:2021-05-18 发布日期:2021-05-18
通讯作者: Hao-Wei Li E-mail:lhw2@mail.ustc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11974331).

Bose-Einstein condensates under a non-Hermitian spin-orbit coupling

Hao-Wei Li(李浩伟)^† and Jia-Zheng Sun(孙佳政)

CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China

Received:2020-10-19 Revised:2020-12-11 Accepted:2021-01-04 Online:2021-05-18 Published:2021-05-18
Contact: Hao-Wei Li E-mail:lhw2@mail.ustc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11974331).

摘要/Abstract

摘要： We study the properties of Bose-Einstein condensates under a non-Hermitian spin-orbit coupling (SOC), induced by a dissipative two-photon Raman process. We focus on the dynamics of the condensate at short times, when the impact of decoherence induced by quantum jumps is negligible and the dynamics is coherently driven by a non-Hermitian Hamiltonian. Given the significantly modified single-particle physics by dissipative SOC, the interplay of non-Hermiticity and interaction leads to a quasi-steady-state phase diagram different from its Hermitian counterpart. In particular, we find that dissipation can induce a phase transition from the stripe phase to the plane-wave phase. We further map out the phase diagram with respect to the dissipation and interaction strengths, and finally investigate the stability of quasi-steady states through the time-dependent dissipative Gross-Pitaevskii equation. Our results are readily accessible based on standard experiments with synthetic spin-orbit couplings.

关键词: BEC, non-Hermitian SOC, phase transitian, Gross-Pitaevskii equation

Abstract: We study the properties of Bose-Einstein condensates under a non-Hermitian spin-orbit coupling (SOC), induced by a dissipative two-photon Raman process. We focus on the dynamics of the condensate at short times, when the impact of decoherence induced by quantum jumps is negligible and the dynamics is coherently driven by a non-Hermitian Hamiltonian. Given the significantly modified single-particle physics by dissipative SOC, the interplay of non-Hermiticity and interaction leads to a quasi-steady-state phase diagram different from its Hermitian counterpart. In particular, we find that dissipation can induce a phase transition from the stripe phase to the plane-wave phase. We further map out the phase diagram with respect to the dissipation and interaction strengths, and finally investigate the stability of quasi-steady states through the time-dependent dissipative Gross-Pitaevskii equation. Our results are readily accessible based on standard experiments with synthetic spin-orbit couplings.

Key words: BEC, non-Hermitian SOC, phase transitian, Gross-Pitaevskii equation

中图分类号: (Bose-Einstein condensates in optical potentials)

67.85.Hj

05.30.Rt (Quantum phase transitions) 03.75.Nt (Other Bose-Einstein condensation phenomena) 71.35.Lk (Collective effects (Bose effects, phase space filling, and excitonic phase transitions))

Hao-Wei Li(李浩伟) and Jia-Zheng Sun(孙佳政). Bose-Einstein condensates under a non-Hermitian spin-orbit coupling[J]. 中国物理B, 2021, 30(6): 66702-066702.

Hao-Wei Li(李浩伟) and Jia-Zheng Sun(孙佳政). Bose-Einstein condensates under a non-Hermitian spin-orbit coupling[J]. Chin. Phys. B, 2021, 30(6): 66702-066702.

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Bose-Einstein condensates under a non-Hermitian spin-orbit coupling

Bose-Einstein condensates under a non-Hermitian spin-orbit coupling

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