Spin Josephson effects of spin-orbit-coupled Bose-Einstein condensates in a non-Hermitian double well

被引:7
作者
Tang, Jia [1 ]
Hu, Zhou [1 ]
Zeng, Zhao-Yun [2 ]
Xiao, Jinpeng [2 ]
Li, Lei [2 ]
Chen, Yajiang [1 ]
Chen, Ai-Xi [1 ]
Luo, Xiaobing [1 ,2 ]
机构
[1] Zhejiang Sci Tech Univ, Dept Phys, Hangzhou 310018, Peoples R China
[2] Jinggangshan Univ, Sch Math & Phys, Jian 343009, Peoples R China
基金
中国国家自然科学基金;
关键词
SO-coupling; current; non-Hermitian; PT-symmetric; DYNAMICS;
D O I
10.1088/1361-6455/aca852
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this paper, we investigate the spin and tunneling dynamics of a spin-orbit-coupled noninteracting Bose-Einstein condensate in a periodically driven non-Hermitian double-well potential. Under high-frequency driving, we obtain the effective time-averaged Hamiltonian by using the standard time-averaging method, and analytically calculate the Floquet quasienergies, revealing that the parity-time (PT)-breaking phase transition appears even for arbitrarily small non-Hermitian parameters when the spin-orbit coupling strength takes half-integer value, irrespective of the values of other parameters used. When the system is PT-symmetric with balanced gain and loss, we find numerically and analytically that in the broken PT-symmetric regions, there will exist the net spin current together with a vanishing atomic current, if we drop the contribution of the exponential growth of the norm to the current behaviors. When the system is non-PT-symmetric, though the quasienergies are partial complex, a stable net spin current can be generated by controlling the periodic driving field, which is accompanied by a spatial localization of the condensate in the well with gain. The results deepen the understanding of non-Hermitian physics and could be useful for engineering a variety of devices for spintronics.
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页数:11
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