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Vortex reconnections in atomic condensates at finite temperature

Lookup NU author(s): Dr Joy Allen, Professor Nikolaos Proukakis, Professor Carlo Barenghi

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Abstract

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.


Publication metadata

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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