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

23rd International Laser Physics Workshop

Stagg, G.W.^1 ; Allen, A.J.^1 ; Barenghi, C.F.^1 ; Parker, N.G.^1

Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne

NE1 7RU, United Kingdom^1

关键词: Atomic Bose-Einstein condensate;    Quantized vortex;    Quantum turbulence;    Superfluid flows;    Trapped condensates;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012044/pdf
DOI  :  10.1088/1742-6596/594/1/012044

来源: IOP

【 摘 要 】

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.