Physics – Condensed Matter – Quantum Gases
Scientific paper
2012-04-05
Physics
Condensed Matter
Quantum Gases
7 pages, 7 figures. Reference [29] updated for v2
Scientific paper
Under suitable forcing a fluid exhibits turbulence, with characteristics strongly affected by the fluid's confining geometry. Here we study two-dimensional quantum turbulence in a highly oblate Bose-Einstein condensate in an annular trap. As a compressible quantum fluid, this system affords a rich phenomenology, allowing coupling between vortex and acoustic energy. Small-scale stirring generates an experimentally observed disordered vortex distribution that evolves into large-scale flow in the form of a persistent current. Numerical simulation of the experiment reveals additional characteristics of two-dimensional quantum turbulence: spontaneous clustering of same-circulation vortices, and an incompressible energy spectrum with $k^{-5/3}$ dependence for low wavenumbers $k$ and $k^{-3}$ dependence for high $k$.
Anderson Brian P.
Bradley Alexander S.
Carretero-González Ricardo
Davis Mark J.
Kevrekidis Panagiotis G.
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