Onsager-Kraichnan condensation in decaying two-dimensional quantum turbulence

T. P. Billam, M. T. Reeves, B. P. Anderson, A. S. Bradley

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

Despite the prominence of Onsager's point-vortex model as a statistical description of 2D classical turbulence, a first-principles development of the model for a realistic superfluid has remained an open problem. Here we develop a mapping of a system of quantum vortices described by the homogeneous 2D Gross-Pitaevskii equation (GPE) to the point-vortex model, enabling Monte Carlo sampling of the vortex microcanonical ensemble. We use this approach to survey the full range of vortex states in a 2D superfluid, from the vortex-dipole gas at positive temperature to negative-temperature states exhibiting both macroscopic vortex clustering and kinetic energy condensation, which we term an Onsager-Kraichnan condensate (OKC). Damped GPE simulations reveal that such OKC states can emerge dynamically, via aggregation of small-scale clusters into giant OKC clusters, as the end states of decaying 2D quantum turbulence in a compressible, finite-temperature superfluid. These statistical equilibrium states should be accessible in atomic Bose-Einstein condensate experiments.

Original languageEnglish (US)
Article number145301
JournalPhysical review letters
Volume112
Issue number14
DOIs
StatePublished - Apr 11 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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