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

doi:10.1088/1674-1056/abd7e4

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.

Keywords: BEC non-Hermitian SOC phase transitian Gross-Pitaevskii equation

Received: 19 October 2020
Revised: 11 December 2020
Accepted manuscript online: 04 January 2021

PACS:	67.85.Hj	(Bose-Einstein condensates in optical potentials)
	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))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11974331).

Corresponding Authors: Hao-Wei Li
E-mail: lhw2@mail.ustc.edu.cn

Cite this article:

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

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

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