Topological stirring of two-dimensional atomic Bose-Einstein condensates

Tangled Magnetic Fields in Astro- and Plasma Physics; Quantised Flux in Tightly Knotted and Linked Systems

White, A.C.^1,2 ; Proukakis, N.P.^1 ; Barenghi, C.F.^1

Joint Quantum Centre (JQC), School of Mathematics and Statistics, Newcastle University, Newcastle-upon-Tyne

NE1 7RU, United Kingdom^1

School of Mathematical Sciences, University of Nottingham, University Park, Nottingham

NG7 2RD, United Kingdom^2

关键词: Atomic Bose-Einstein condensate;    Classical fluids;    Finite order;    Quantum turbulence;    Topological chaos;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/544/1/012021/pdf
DOI  :  10.1088/1742-6596/544/1/012021

来源: IOP

【 摘 要 】

We stir vortices into a trapped quasi two-dimensional atomic Bose-Einstein condensate by moving three laser stirrers. We apply stirring protocols introduced by Boyland et al. (2000), that efficiently build in topological chaos in classical fluids and are classified as Pseudo-Anosov stirring protocols. These are compared to their inefficient mixing counterparts, finite-order stirring protocols. We investigate if inefficient stirring protocols result in a more clustered distribution of vortices. The efficiency with which vortices are 'mixed' or distributed in a condensate is important for investigating dynamics of continuously forced quantum turbulence and the existence of the inverse cascade in turbulent two-dimensional superfluids.