The Different Temperature-Dependent Behaviors of Dark Solitons in Fermi Superfluid Gases Along the BCS–BEC Crossover

Qu, Rong-Bo; Li, K.; Bai, Yan-Peng; Zhao, Huaisong

doi:10.1007/s10909-021-02622-7

Cited by 2 publications

(1 citation statement)

References 33 publications

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“…Dark solitons -dips in the density which preserve their shapes while moving-are the subject of intense investigation, in particular in superfluid atomic gases [12][13][14][15][16][17][18][19][20][21][22]. Dark solitons in fermionic superfluids behave differenty in the BCS regime and in the BEC regime [20].…”

Section: Introductionmentioning

confidence: 99%

Dark solitons impinging on interfaces in a superfluid Fermi gas

Merckx

Tempere

2022

Front. Phys.

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Ultracold quantum gases in the superfluid regime exhibit solitons, localized excitations that require nonlinearity of the underlying field equation in order to preserve their shape as they propagate. Here, we investigate the behavior of solitons at an inhomogeneity: an interface that separates two different interaction regimes of a superfluid Fermi gas. It is known that the soliton properties depend on the interaction regime, but what happens as a soliton impinges on such an interface is not clear. Using an effective field theory to describe the superfluid Fermi gas, we reveal the nontrivial dynamics of such a collision. Whether the original soliton makes it through the interface depends on the amplitude of the soliton. Regardless of whether the original soliton is transmitted or not, there will always be a shock wave with a phonon train created behind the interface and reflected secondary solitons. The details of this dynamics depends strongly on the equation of state corresponding to underlying microscopic theory describing the superfluid Fermi gas, and we argue that these collisions are realistic experimental probes to test microscopic theories of pairing in ultracold Fermi gases.

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Section: Introductionmentioning

confidence: 99%

Dark solitons impinging on interfaces in a superfluid Fermi gas

Merckx

Tempere

2022

Front. Phys.

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Envelope solitons of a discrete NLSE via the multi-scale quasi-discrete approximation method

Wang

2024

Opt. Express

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The goal of this work is to obtain some envelope solitary solutions of a discrete nonlinear Schrödinger equation (NLSE) in a local optical lattice potential well through symbolic computation. By multiple scales combined with a quasi-discrete approximation method, an envelope soliton solution is constructed for the proposed equations. Moreover, the dynamics of the resulting envelope solitonary solutions are discussed. It was found that stability appeared in the system. In addition to the fixed symmetric envelope solitons, a new nonlinear element excitation, periodic kink bright and dark envelope solitons, are also observed. The degree can be controlled by the lattice constant and the depth of the optical lattice well. Consequently, it may provide a theoretical basis for the fabrication of the controllable matter-wave soliton controller and splitter.

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The Different Temperature-Dependent Behaviors of Dark Solitons in Fermi Superfluid Gases Along the BCS–BEC Crossover

Cited by 2 publications

References 33 publications

Dark solitons impinging on interfaces in a superfluid Fermi gas

Dark solitons impinging on interfaces in a superfluid Fermi gas

Envelope solitons of a discrete NLSE via the multi-scale quasi-discrete approximation method

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