Classical and quantum vortex leapfrogging in two-dimensional channels

Galantucci, Luca; Sciacca, Michele; Parker, N. G.; Baggaley, Andrew W.; Barenghi, Carlo F.

doi:10.1017/jfm.2020.1094

Cited by 2 publications

(2 citation statements)

References 74 publications

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“…The dissipative anomaly is also referred to as the zeroth law of turbulence due to its fundamental importance for the turbulence theory, and it states that dissipation should remain finite even in the limit of vanishing viscosity (or infinite Reynolds number). However, its nature and very existence for various forms of turbulence is still an active topic of research 47,48 .…”

Section: Articlementioning

confidence: 99%

Rotating quantum wave turbulence

et al. 2023

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Turbulence under strong influence of rotation is described as an ensemble of interacting inertial waves across a wide range of length scales. In macroscopic quantum condensates, the quasiclassical turbulent dynamics at large scales is altered at small scales, where the quantization of vorticity is essential. The nature of this transition remains an unanswered question. Here we expand the concept of wave-driven turbulence to rotating quantum fluids where the spectrum of waves extends to microscopic scales as Kelvin waves on quantized vortices. We excite inertial waves at the largest scale by periodic modulation of the angular velocity and observe dissipation-independent transfer of energy to smaller scales and the eventual onset of the elusive Kelvin wave cascade at the lowest temperatures. We further find that energy is pumped to the system through a boundary layer distinct from the classical Ekman layer and support our observations with numerical simulations. Our experiments demonstrate a regime of turbulent motion in quantum fluids where the role of vortex reconnections can be neglected, thus stripping the transition between the classical and the quantum regimes of turbulence down to its constituent components.

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Section: Articlementioning

confidence: 99%

Rotating quantum wave turbulence

et al. 2023

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“…We start by noting that for rather low values of V 0 /µ, e.g. V 0 /µ = 0.2 − 0.4, the large vortex ring entering the condensate interacts strongly, and on a relatively short timescale after commencing its axial propagation, with its image vortices [55] and, as a result of the radial anisotropy of the trap, it almost immediately breaks up into two vortex lines. Shortly after, the vortex structure reverses its motion, travelling towards the barrier (which it can even surpass for V 0 /µ = 0.2).…”

Section: Microscopic Descriptionmentioning

confidence: 99%

Dynamical Phase Diagram of Ultracold Josephson Junctions

Xhani,

Galantucci,

Barenghi

et al. 2020

Preprint

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We provide a complete study of the phase diagram characterising the distinct dynamical regimes emerging in a three-dimensional Josephson junction in an ultracold quantum gas. Considering trapped ultracold superfluids separated into two reservoirs by a barrier of variable height and width, we analyse the population imbalance dynamics following a variable initial population mismatch. We demonstrate that as the chemical potential difference is increased, the system transitions from Josephson plasma oscillations to either a dissipative (in the limit of low and narrow barriers) or a self-trapped regime (for large and wider barriers), with a crossover between the dissipative and the self-trapping regimes which we explore and characterize for the first time. This work, which extends beyond the validity of the standard two-mode model, connects the role of the barrier width, vortex rings and associated acoustic emission with different regimes of the superfluid dynamics across the junction, establishing a framework for its experimental observation, which is found to be within current experimental reach.

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Classical and quantum vortex leapfrogging in two-dimensional channels

Abstract: Abstract

Cited by 2 publications

References 74 publications

Rotating quantum wave turbulence

Rotating quantum wave turbulence

Dynamical Phase Diagram of Ultracold Josephson Junctions

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