Signatures of coherent vortex structures in a disordered two-dimensional quantum fluid

Matthew T. Reeves, Thomas P. Billam, Brian P Anderson, Ashton S. Bradley

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The emergence of coherent rotating structures is a phenomenon characteristic of both classical and quantum two-dimensional (2D) turbulence. In this work we show theoretically that the coherent vortex structures that emerge in decaying 2D quantum turbulence can approach quasiclassical rigid-body rotation, obeying the Feynman rule of constant average areal vortex density while remaining spatially disordered. By developing a rigorous link between the velocity probability distribution and the quantum kinetic energy spectrum over wave number k, we show that the coherent vortex structures are associated with a k3 power law in the infrared region of the spectrum, and a well-defined spectral peak that is a physical manifestation of the largest structures. We discuss the possibility of realizing coherent structures in Bose-Einstein condensate experiments and present Gross-Pitaevskii simulations showing that this phenomenon, and its associated spectral signatures, can emerge dynamically from feasible initial vortex configurations.

Original languageEnglish (US)
Article number053631
JournalPhysical Review A
Volume89
Issue number5
DOIs
StatePublished - May 30 2014

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signatures
vortices
fluids
turbulence
spectral signatures
rigid structures
Bose-Einstein condensates
energy spectra
kinetic energy
configurations
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Signatures of coherent vortex structures in a disordered two-dimensional quantum fluid. / Reeves, Matthew T.; Billam, Thomas P.; Anderson, Brian P; Bradley, Ashton S.

In: Physical Review A, Vol. 89, No. 5, 053631, 30.05.2014.

Research output: Contribution to journalArticle

Reeves, Matthew T. ; Billam, Thomas P. ; Anderson, Brian P ; Bradley, Ashton S. / Signatures of coherent vortex structures in a disordered two-dimensional quantum fluid. In: Physical Review A. 2014 ; Vol. 89, No. 5.
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