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- W4310582344 abstract "Abstract 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 ( <?CDATA $mathcal{PT}$?> )-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 <?CDATA $mathcal{PT}$?> -symmetric with balanced gain and loss, we find numerically and analytically that in the broken <?CDATA $mathcal{PT}$?> -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- <?CDATA $mathcal{PT}$?> -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." @default.
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- W4310582344 date "2022-12-20" @default.
- W4310582344 modified "2023-09-24" @default.
- W4310582344 title "Spin Josephson effects of spin–orbit-coupled Bose–Einstein condensates in a non-Hermitian double well" @default.
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- W4310582344 doi "https://doi.org/10.1088/1361-6455/aca852" @default.
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