Physics of manipulation of spin dynamics in a driven double well made transparent

Li, Wenjuan; Yin, Haochuan; Yang, Jia; Luo, Yuxin; Xie, Xin; Wang, Hai; Luo, Y. X.

doi:10.1016/j.rinp.2022.105706

Cited by 3 publications

(3 citation statements)

References 66 publications

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“…Such Raman-induced SOC opens new possibilities for investigating the Josephson effects (JEs) in twocomponent cold atom systems, for which two components can be explained as two hyperfine (pseudospin) atomic states. Recently, the role played by SOC on the tunneling dynamics of BECs in double-well potentials were addressed in several works [47][48][49][50][51][52][53][54]. In reference [47], Zhang and co-worker discovered that a net atomic spin current termed as spin JEs can be induced by the spin-dependent tunneling between two wells.…”

Section: Introductionmentioning

confidence: 99%

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

Tang¹,

Zhou²,

Zeng³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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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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Section: Introductionmentioning

confidence: 99%

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

Tang¹,

Zhou²,

Zeng³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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“…Synthetic SO coupling of both Bose and Fermi gases has been realized in recent experiments [29][30][31][32][33][34][35], which opens a completely new and ideal avenue for investigating quantum dynamics of SO-coupled cold atomic systems. There have been a great number of research works focusing on novel dynamics of SO-coupled cold atomic systems , for instance, quantum spin dynamics [38,39], spin Josephson dynamics [41][42][43][44] and localization [45,46], Anderson transition of SO-coupled cold atoms [47], collective dynamics [32,48], Bloch oscillation dynamics [50], selective coherent spin transportation [55], spin-dependent dynamic localization [58], controlling stable spin dynamics [59], transparent manipulation of spin dynamics [62], coherent control of spin tunneling [63], and so on. To our knowledge, many works related to the quantum dynamics of SO-coupled cold atomic systems have been studied by applying approximate methods [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][6...…”

Section: Introductionmentioning

confidence: 99%

Exact solutions for a spin-orbit coupled ultracold atom held in a driven double well

Luo

Wang

Jia

et al. 2023

J. Phys. A: Math. Theor.

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Exact solutions for spin-orbit (SO) coupled cold atomic systems are very important and rare in physics. In this paper, we propose a simple method of combined modulations to generate the exactly analytic solutions for a single SO-coupled ultracold atom held in a driven double well. For the cases of synchronous combined modulations and the spin-conserving tunneling, we obtain the generally accurate solutions of this system respectively. For the case of spin-flipping tunneling under asynchronous combined modulations, we get the specially exact solutions in simple form when the driving parameters are appropriately chosen. Based on these obtained exact solutions, we reveal some intriguing quantum spin dynamical phenomena, for instance, the arbitrary coherent population transfer (ACPT) with and/or without spin-flipping, the controlled coherent population conservation (CPC), and the controlled coherent population inversion (CPI). The results may provide a possibility for generating the accurate quantum entangled states and the exact control of spin dynamics for a SO-coupled ultracold atomic system.

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“…In recent years, the experimental realization of artificial SO-coupling of ultracold atoms has provided a new platform for studying the quantum dynamics of ultracold atomic systems [72][73][74][75][76][77][78]. Many of novel quantum spin dynamical phenomena for SO-coupled ultracold atomic systems have been discovered, for instance, selective spin transport in a double-well potential [79], spin Josephson effects [80][81][82], dynamical suppression of tunneling [83], transparent control of spin dynamics [84], coherent control of spin-dependent localization [85], spin tunneling dynamics [86], and so on.…”

Section: Introductionmentioning

confidence: 99%

Analytical results for a spin–orbit coupled atom held in a non-Hermitian double well under synchronous combined modulations

Xie,

Cui,

Luo

et al. 2023

J. Phys. A: Math. Theor.

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We propose a simple method of synchronous combined modulations to generate the exact analytic solutions for a spin-orbit (SO) coupled ultracold atom held in a non-Hermitian double-well potential. Based on the obtained analytical solutions, we mainly study the parity-time (PT) symmetry of this system and the system stability for both balanced and unbalanced gain-loss between two wells. Under balanced gain and loss, the effect of the proportional constants between synchronous combined modulations and the SO-coupling strength on the PT-symmetry breaking is revealed analytically. Surprisingly, we ﬁnd when the Zeeman ﬁeld is present, the stable spin-ﬂipping tunneling between two wells cannot occur in the non-Hermitian SO-coupled ultracold atomic system, but the stable spin-conserving tunneling can be performed. Under unbalanced gain and loss, the unique set of parameter conditions that can cause the system to stabilize is found. The results may provide a possibility for the exact control of PT-symmetry breaking and quantum spin dynamics in a non-Hermitian SO-coupled system.

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Physics of manipulation of spin dynamics in a driven double well made transparent

Cited by 3 publications

References 66 publications

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

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

Exact solutions for a spin-orbit coupled ultracold atom held in a driven double well

Analytical results for a spin–orbit coupled atom held in a non-Hermitian double well under synchronous combined modulations

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