Rotating quantum turbulence in the unitary Fermi gas

Hossain, Khalid; Kobuszewski, Konrad; Forbes, Michael McNeil; Magierski, Piotr; Sekizawa, Kazuyuki; Wlazłowski, Gabriel

doi:10.1103/physreva.105.013304

Cited by 17 publications

(11 citation statements)

References 55 publications

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“…The coupling constants β and γ are adjusted to ensure correct reproduction of basic properties of the uniform gas, like the Bertsch parameter ξ 0 ≈ 0.4 and the energy gap Δ=ε F ≈ 0.5. Over the years, the SLDA approach has been successfully applied to a variety of problems, like dynamics of topological defects [29][30][31][32][33], Higgs modes [34], properties of spin-imbalanced systems [27,[35][36][37][38], and even quantum turbulence [39,40].…”

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confidence: 99%

Dissipation Mechanisms in Fermionic Josephson Junction

et al. 2023

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We characterize numerically the dominant dynamical regimes in a superfluid ultracold fermionic Josephson junction. Beyond the coherent Josephson plasma regime, we discuss the onset and physical mechanism of dissipation due to the superflow exceeding a characteristic speed, and provide clear evidence distinguishing its physical mechanism across the weakly and strongly interacting limits, despite qualitative dynamics of global characteristics being only weakly sensitive to the operating dissipative mechanism. Specifically, dissipation in the strongly interacting regime occurs through the phase-slippage process, caused by the emission and propagation of quantum vortices, and sound waves-similar to the Bose-Einstein condensation limit. Instead, in the weak interaction limit, the main dissipative channel arises through the pair-breaking mechanism.

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confidence: 99%

Dissipation Mechanisms in Fermionic Josephson Junction

et al. 2023

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“…The drain flow twisted bundle is similar to other twisted vortex states which have been observed in superconductors [12], and, more relevantly, in rotating 3 He [13] and large-scale 4 He vortex rings [14][15][16]. Finally, by combining order (the strong axial polarization) with a controlled amount of disorder (induced by the radial drain flow), our results show that this bathtub vortex flow is a promising configuration to develop theoretical tools based on the HVBK equations and Vinen equation [17,18] to model problems of rotating quantum turbulence [19], ranging from liquid helium counterflow [20,21] to neutron star glitches [22,23] to atomic gases [24].…”

Section: Discussionmentioning

confidence: 90%

Superfluid drain vortex

Ruffenach

Galantucci

Barenghi

2022

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Drain vortices are among the most common vortices observed in everyday life, yet their physics is complex due to the competition of vorticity's transport and diffusion, and the presence of viscous layers and a free surface. Recently, it has become possible to study experimentally drain vortices in superfluid liquid helium, a fluid in which the physics is simplified by the absence of viscosity and the quantisation of the circulation. Using the Gross-Pitaevskii equation, we make a simple model of the problem which captures the essential physics ingredients, showing that the superfluid drain vortex consists of a bundle of vortex lines which twist, thus strengthening the axial flow into the drain.

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“…Finally, by combining order (the strong axial polarization) with a controlled amount of disorder (induced by the radial drain flow), our results show that this bathtub vortex flow is a promising configuration to develop theoretical tools based on the HVBK equations and Vinen equation [17,18] to model problems of rotating quantum turbulence [19], ranging from liquid helium counterflow [20,21] to neutron star glitches [22,23] to atomic gases [24].…”

Section: Discussionmentioning

confidence: 99%

Superfluid Drain Vortex

2023

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Drain vortices are among the most common vortices observed in everyday life, yet their physics is complex due to the competition of vorticity’s transport and diffusion, and the presence of viscous layers and a free surface. Recently, it has become possible to study experimentally drain vortices in liquid helium II, a quantum fluid whose physics is characterised by the absence of viscosity and the quantisation of the circulation in the superfluid component. Using the Gross–Pitaevskii equation, we make a simple model of the problem which captures the essential physics ingredients, showing that the drain vortex of a pure superfluid consists of a bundle of vortex lines which, in the presence of a radial drain, twist, thus strengthening the axial flow into the drain.

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Rotating quantum turbulence in the unitary Fermi gas

Cited by 17 publications

References 55 publications

Dissipation Mechanisms in Fermionic Josephson Junction

Dissipation Mechanisms in Fermionic Josephson Junction

Superfluid drain vortex

Superfluid Drain Vortex

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