Fluctuational susceptibility of ultracold bosons in the vicinity of condensation

We study the behaviour of ultracold bosonic gas in the critical region above the Bose-Einstein condensation in the presence of an artificial magnetic field, \(B_\mathrm{art}\). We show that the condensate fluctuations above the critical temperature \(T_c\) cause the fluctuational susceptibility, \(\...

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Bibliographic Details
Published in:arXiv.org 2016-05
Main Authors: Kingl, Arvid J, Gangardt, D M, Lerner, Igor V
Format: Article
Language:English
Subjects:
Bosons
Condensation
Critical temperature
Divergence
Magnetic permeability
Variation
Online Access:Get full text
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Summary:We study the behaviour of ultracold bosonic gas in the critical region above the Bose-Einstein condensation in the presence of an artificial magnetic field, \(B_\mathrm{art}\). We show that the condensate fluctuations above the critical temperature \(T_c\) cause the fluctuational susceptibility, \(\chi _\mathrm{fl}\), of a uniform gas to have a stronger power-law divergence than in an analogous superconducting system. Measuring such a divergence opens new ways of exploring critical properties of the ultracold gas and an opportunity of an accurate determination of \(T_c\). We describe a method of measuring \(\chi _\mathrm{fl}\) which requires a constant gradient in \(B_\mathrm{art}\) and suggest a way of creating such a field in experiment.
ISSN:2331-8422
DOI:10.48550/arxiv.1506.04053