Dissipation-facilitated molecules in a Fermi gas with non-Hermitian spin-orbit coupling

Zhou, Lihong; Wu, Yi; Cui, Xiaoling

doi:10.1103/physreva.102.043310

Cited by 20 publications

(16 citation statements)

References 40 publications

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“…Investigating how the interplay between two mechanisms -SOC and non-Hermiticity -may bring about new quantum phenomena, such as non-Hermitian topological phases in Bloch bands [6], will be interesting. In contrast to classical systems where only single (bosonic) particle dynamics are considered, our system sets the stage for investigating many-body interacting fermions with dissipation [46,47]. Furthermore, the possibility of exploring nonequilibrium dynamics, quantum thermodynamics [48] and information criticality [49] across the PT symmetry-breaking transition by engineering the non-Hermitian Hamiltonian in a dynamic manner is conceivable.…”

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confidence: 99%

Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions

Ren¹,

Liu²,

Zhao³

et al. 2021

Preprint

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While spin-orbit coupling (SOC), an essential mechanism underlying quantum phenomena from the spin Hall effect to topological insulators [1, 2], has been widely studied in well-isolated Hermitian systems, much less is known when the dissipation plays a major role in spin-orbit-coupled quantum systems [3]. Here, we realize dissipative spin-orbit-coupled bands filled with ultracold fermions, and observe a parity-time (PT ) symmetrybreaking transition as a result of the competition between SOC and dissipation. Tunable dissipation, introduced by state-selective atom loss, enables the energy gap, opened by SOC, to be engineered and closed at the critical dissipation value, the so-called exceptional point (EP) [4]. The realized EP of the non-Hermitian band structure exhibits chiral response when the quantum state changes near the EP. This topological feature enables us to tune SOC and dissipation dynamically in the parameter space, and observe the state evolution is direction-dependent near the EP, revealing topologically robust spin transfer between different quantum states when the quantum state encircles the EP. This topological control of quantum states for non-Hermitian fermions provides new methods of quantum control, and also sets the stage for exploring non-Hermitian topological states with SOC.

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confidence: 99%

Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions

Ren¹,

Liu²,

Zhao³

et al. 2021

Preprint

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“…Following the derivation in Ref. [31], a non-interacting, two-component Fermi gas under a non-Hermitian SOC is governed by the non-Hermitian Hamiltonian where…”

Section: Model and Single-particle Dispersionmentioning

confidence: 99%

“…While some non-Hermitian systems still acquire purely real eigen spectra thanks to the parity-time symmetry [2,3], some may possess properties such as skin effects and non-Bloch bulk-boundary correspondence [4][5][6][7][8][9][10][11][12], with deep topological origins that are non-existent in their Hermitian counterparts [13,14]. A key issue in the study of non-Hermitian systems is the interplay of interaction and non-Hermiticity in a many-body setting [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. It has been shown that such an interplay gives rise to significantly modified dynamics in bosons [15][16][17], as well as unconventional pairing superfluid in fermions [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that such an interplay gives rise to significantly modified dynamics in bosons [15][16][17], as well as unconventional pairing superfluid in fermions [19,20]. In a very recent study, a non-Hermitian version of the spin-orbit coupling (SOC) has been proposed [31], under which the SOC-dressed and dissipative single-particle dispersion results in a dissipation-facilitated molecular state. The impact of such a non-Hermitian synthetic gauge field in a genuine many-body system is still largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Impurity in a Fermi gas under non-Hermitian spin–orbit coupling

Sun

2021

Eur. Phys. J. D

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“…So far, a wide spectrum of non-Hermitian phenomena, ranging from paritytime (PT)-symmetry breaking and non-Hermitian criticality [8][9][10], to non-Hermitian skin effects and non-Bloch topology [11][12][13][14][15][16][17][18], have been experimentally implemented and explored in quantum mechanical systems such as the single-photon interferometry network [19][20][21], cold atoms [22][23][24][25][26], nitrogen-vacancy centers [27,28], superconducting qubits [29], and trapped ions [30,31]. While most of these experiments investigate the single-particle aspects of the non-Hermitian physics, the interplay of non-Hermiticity and interaction is a fast-growing frontier with many open questions and fresh challenges [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Probing two-body exceptional points in open dissipative systems

Ding,

2021

Preprint

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We study two-body non-Hermitian physics in the context of an open dissipative system depicted by the Lindblad master equation. Adopting a minimal lattice model of a handful of interacting fermions with single-particle dissipation, we show that the non-Hermitian effective Hamiltonian of the master equation gives rise to two-body scattering states with state-and interaction-dependent parity-time transition. The resulting two-body exceptional points can be extracted from the tracepreserving density-matrix dynamics of the same dissipative system with three atoms. Our results not only demonstrate the interplay of PT symmetry and interaction on the exact few-body level, but also serve as a minimal illustration on how key features of non-Hermitian few-body physics can be probed in an open dissipative many-body system.

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Dissipation-facilitated molecules in a Fermi gas with non-Hermitian spin-orbit coupling

Cited by 20 publications

References 40 publications

Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions

Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions

Impurity in a Fermi gas under non-Hermitian spin–orbit coupling

Probing two-body exceptional points in open dissipative systems

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