Lookup NU author(s): Dr Joy Allen,
Professor Nikolaos Proukakis
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
We simulate the dissipative evolution of a vortex in a trapped finite-temperature dilute-gas Bose-Einstein condensate using first-principles open-systems theory. Simulations of the complete stochastic projected Gross-Pitaevskii equation for a partially condensed Bose gas containing a single quantum vortex show that the transfer of condensate energy to the incoherent thermal component without population transfer provides an important channel for vortex decay. For the lower temperatures considered, this effect is significantly larger that the population transfer process underpinning the standard theory of vortex decay, and is the dominant determinant of the vortex lifetime. A comparison with the Zaremba-Nikuni-Griffin kinetic (two-fluid) theory further elucidates the role of the particle transfer interaction, and suggests the need for experimental testing of reservoir interaction theory. The dominance of this particular energetic decay mechanism for this open quantum system should be testable with current experimental setups, and its observation would have broad implications for the dynamics of atomic matter waves and experimental studies of dissipative phenomena.
Author(s): Rooney SJ, Allen AJ, Zulicke U, Proukakis NP, Bradley AS
Publication type: Article
Publication status: Published
Journal: Physical Review A
Online publication date: 02/06/2016
Acceptance date: 14/05/2016
Date deposited: 28/09/2016
ISSN (print): 2469-9926
ISSN (electronic): 2469-9934
Publisher: American Physical Society
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