Decaying quantum turbulence in a two-dimensional Bose-Einstein condensate at finite temperature
Andrew J. Groszek, Matthew J. Davis, Tapio P. Simula
SciPost Phys. 8, 039 (2020) · published 12 March 2020
- doi: 10.21468/SciPostPhys.8.3.039
- Submissions/Reports
Abstract
We numerically model decaying quantum turbulence in two-dimensional disk-shaped Bose-Einstein condensates, and investigate the effects of finite temperature on the turbulent dynamics. We prepare initial states with a range of condensate temperatures, and imprint equal numbers of vortices and antivortices at randomly chosen positions throughout the fluid. The initial states are then subjected to unitary time-evolution within the c-field methodology. For the lowest condensate temperatures, the results of the zero temperature Gross-Pitaevskii theory are reproduced, whereby vortex evaporative heating leads to the formation of Onsager vortex clusters characterised by a negative absolute vortex temperature. At higher condensate temperatures the dissipative effects due to vortex-phonon interactions tend to drive the vortex gas towards positive vortex temperatures dominated by the presence of vortex dipoles. We associate these two behaviours with the system evolving toward an anomalous non-thermal fixed point, or a Gaussian thermal fixed point, respectively.
Cited by 11
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 Andrew J. Groszek,
- 3 Matthew J. Davis,
- 2 4 Tapio Simula
- 1 Monash University
- 2 Joint Quantum Centre Durham-Newcastle [JQC]
- 3 University of Queensland
- 4 Swinburne University of Technology