Classical-like wakes past elliptical obstacles in atomic Bose-Einstein condensates

We reinvestigate numerically the classic problem of two-dimensional superfluid flow past an obstacle. Taking the obstacle to be elongated (perpendicular to the flow), rather than the usual circular form, is shown to promote the nucleation of quantized vortices, enhance their subsequent interactions,...

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Bibliographic Details
Published in:Journal of physics. Conference series 2015-03, Vol.594 (1), p.12044
Main Authors: Stagg, G W, Allen, A J, Barenghi, C F, Parker, N G
Format: Article
Language:English
Subjects:
Barriers
Bose-Einstein condensates
Fluid flow
Fluids
Nucleation
Physics
Quantum turbulence
Superfluidity
Two dimensional flow
Wakes
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Summary:We reinvestigate numerically the classic problem of two-dimensional superfluid flow past an obstacle. Taking the obstacle to be elongated (perpendicular to the flow), rather than the usual circular form, is shown to promote the nucleation of quantized vortices, enhance their subsequent interactions, and lead to wakes which bear striking similarity to their classical (viscous) counterparts. Then, focussing on the recent experiment of Kwon et al. (arXiv:1403.4658) in a trapped condensate, we show that an elliptical obstacle leads to a cleaner and more efficient means to generate two-dimensional quantum turbulence.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/594/1/012044