Characteristics of Two-Dimensional Quantum Turbulence in a Compressible Superfluid
| Autor: | S. J. Rooney, Ricardo Carretero-González, Ashton S. Bradley, Tyler W. Neely, Panayotis G. Kevrekidis, E. C. Samson, Kody J. H. Law, Brian P. Anderson, Matthew J. Davis, Ewan M. Wright |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Turbulence K-epsilon turbulence model Quantum turbulence General Physics and Astronomy FOS: Physical sciences K-omega turbulence model Mechanics Vorticity 01 natural sciences 010305 fluids & plasmas Vortex Superfluidity Physics::Fluid Dynamics Classical mechanics Quantum Gases (cond-mat.quant-gas) 0103 physical sciences Wavenumber 010306 general physics Condensed Matter - Quantum Gases |
| Popis: | 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 $k$. 7 pages, 7 figures. Reference [29] updated for v2 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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