Core filling and snaking instability of dark solitons in spin-imbalanced superfluid Fermi gases

Reichl, Matthew D.; Mueller, Erich J.

doi:10.1103/physreva.95.053637

Cited by 9 publications

(9 citation statements)

References 37 publications

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“…The soliton propagates towards the edge of the cloud and vanishes, indicating suppression of the snake instability. Phenomenon of stabilization of a dark soliton due to spin-imbalance was studied in papers [32,33] under hypothesis of system uniformity-trap effects were completely neglected and dynamics were investigated effectively in 2D. Here we confirm, that the effect survives in full 3D calculations, which is not a priori obvious, as dimensionality as well as trap effects play a very important role in the context of stability of topological defects.…”

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confidence: 65%

Suppressed Solitonic Cascade in Spin-Imbalanced Superfluid Fermi Gas

et al. 2018

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Cold atoms experiments offer invaluable information on superfluid dynamics, including decay cascades of topological defects. While the cascade properties are well established for Bose systems, our understanding of their behavior in Fermi counterparts is very limited, in particular in spin-imbalanced systems, where superfluid (paired) and normal (unpaired) particles naturally coexist giving rise to complex spatial structure of the atomic cloud. Here we show, based on a newly developed microscopic approach, that the decay cascades of topological defects are dramatically modified by the spin polarization. We demonstrate that decay cascades end up at different stages: "dark soliton," "vortex ring," or "vortex line," depending on the polarization. We reveal that it is caused by sucking of unpaired particles into the soliton's internal structure. As a consequence vortex reconnections are hindered and we anticipate that quantum turbulence phenomenon can be significantly affected, indicating new physics induced by polarization effects.

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confidence: 65%

Suppressed Solitonic Cascade in Spin-Imbalanced Superfluid Fermi Gas

et al. 2018

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“…in a 2D geometry, alias dark soliton stripes (DSS), into vortex-antivortex pairs. A significant volume of theoretical studies examined this dynamical instability [62][63][64][65][66][67][68][69][70][71][72] and the conditions under which it can be suppressed [73][74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Many-body quantum dynamics in the decay of bent dark solitons of Bose–Einstein condensates

et al. 2017

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The beyond mean-field dynamics of a bent dark soliton embedded in a two-dimensional repulsively interacting Bose-Einstein condensate is explored. We examine the case of a single bent dark soliton comparing the mean-field dynamics to a correlated approach, the Multi-Configuration Time-Dependent Hartree method for Bosons. Dynamical snaking of this bent structure is observed, signaling the onset of fragmentation which becomes significant during the vortex nucleation. In contrast to the mean-field approximation "filling" of the vortex core is observed, leading in turn to the formation of filled-core vortices, instead of the mean-field vortex-antivortex pairs. The resulting smearing effect in the density is a rather generic feature, occurring when solitonic structures are exposed to quantum fluctuations. Here, we show that this filling owes its existence to the dynamical building of an antidark structure developed in the next-to-leading order orbital. We further demonstrate that the aforementioned beyond mean-field dynamics can be experimentally detected using the variance of single shot measurements. Additionally, a variety of excitations including vortices, oblique dark solitons, and open ring dark soliton-like structures building upon higher-lying orbitals is observed. We demonstrate that signatures of the higher-lying orbital excitations emerge in the total density, and can be clearly captured by inspecting the one-body coherence. In the latter context, the localization of one-body correlations exposes the existence of the multi-orbital vortex-antidark structure.

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“…2. The tight radial confinement in each tube will prevent the solitons from decaying into vortices and sound waves via the snake instability [62,[74][75][76][77]. This first step is straightforward and we do not model it in detail.…”

Section: Overviewmentioning

confidence: 99%

Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas

Dutta

Mueller

2017

Phys. Rev. A

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We propose a two-step experimental protocol to directly engineer Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in a cold two-component Fermi gas loaded into a quasi-one-dimensional trap. First, one uses phase imprinting to create a train of domain walls in a superfluid with equal number of ↑-and ↓-spins. Second, one applies a radio-frequency sweep to selectively break Cooper pairs near the domain walls and transfer the ↑-spins to a third spin state which does not interact with the ↑-and ↓-spins. The resulting FFLO state has exactly one unpaired ↓-spin in each domain wall and is stable for all values of domain-wall separation and interaction strength. We show that the protocol can be implemented with high fidelity at sufficiently strong interactions for a wide range of parameters available in present-day experimental conditions. arXiv:1706.00994v1 [cond-mat.quant-gas]

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Core filling and snaking instability of dark solitons in spin-imbalanced superfluid Fermi gases

Cited by 9 publications

References 37 publications

Suppressed Solitonic Cascade in Spin-Imbalanced Superfluid Fermi Gas

Suppressed Solitonic Cascade in Spin-Imbalanced Superfluid Fermi Gas

Many-body quantum dynamics in the decay of bent dark solitons of Bose–Einstein condensates

Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas

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