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Lookup NU author(s): Dr Gary LiuORCiD, Dr Andrew BaggaleyORCiD, Professor Carlo Barenghi, Dr Toby Wood
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Author(s) 2024. We employ the Gross–Pitaevskii theory to model a quantized vortex depinning from a small obstacle in a two-dimensional superfluid due to an imposed background superfluid flow. We find that, when the flow’s velocity exceeds a critical value, the vortex drifts orthogonally to the flow before subsequently moving parallel to it away from the pinning site. The motion of the vortex around the pinning site is also accompanied by an emission of a spiral-shaped sound pulse. Through simulations, we present a phase diagram of the critical flow velocity for vortex depinning together with an empirical formula that illustrates how the critical velocity increases with the height and width of the pinning site. By employing a variety of choices of initial and boundary conditions, we are able to obtain lower and upper bounds on the critical velocity and demonstrate the robustness of these results.
Author(s): Liu I-K, Prasad SB, Baggaley AW, Barenghi CF, Wood TS
Publication type: Article
Publication status: Published
Journal: Journal of Low Temperature Physics
Year: 2024
Volume: 215
Pages: 376-396
Print publication date: 01/06/2024
Online publication date: 12/03/2024
Acceptance date: 12/02/2024
Date deposited: 25/03/2024
ISSN (print): 0022-2291
ISSN (electronic): 1573-7357
Publisher: Springer
URL: https://doi.org/10.1007/s10909-024-03064-7
DOI: 10.1007/s10909-024-03064-7
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