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Lookup NU author(s): Dr Joy AllenORCiD, Professor Nikolaos ProukakisORCiD, Professor Carlo Barenghi
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At finite temperatures, the motion of topological defects (such as solitons or vortices) in trapped atomic Bose-Einstein condensates is affected by the presence of an inhomogeneous cloud of thermal atoms. Recent interest in quantum turbulence leads us to investigate the temperature dependence of vortex reconnections - events which are essential ingredients of turbulence. Using the Zaremba-Nikuni-Griffin (ZNG) formalism based on a dissipative Gross-Pitaevskii equation for the condensate coupled to a semiclassical Boltzmann equation for the thermal cloud, we find that, on the typical length scales and time scales of atomic condensates, vortex reconnections are temperature independent. Furthermore, comparison to vortex reconnections in homogeneous condensates show reconnections to be insensitive to inhomogeneity in the background density.
Author(s): Allen AJ, Zuccher S, Caliari M, Proukakis NP, Parker NG, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review A
Year: 2014
Volume: 90
Issue: 1
Online publication date: 02/07/2014
Acceptance date: 02/07/2014
ISSN (print): 2469-9926
ISSN (electronic): 2469-9934
Publisher: American Physical Society
URL: https://doi.org/10.1103/PhysRevA.90.013601
DOI: 10.1103/PhysRevA.90.013601
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