1. Fluctuational susceptibility of ultracold bosons in the vicinity of condensation
- Author
-
Kingl, Arvid J., Gangardt, D. M., and Lerner, Igor V.
- Subjects
Condensed Matter::Quantum Gases ,Quantum Gases (cond-mat.quant-gas) ,FOS: Physical sciences ,Condensed Matter - Quantum Gases - Abstract
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., Comment: 5 pages, 3 figures, 5 pages of Supplement; the text is rewritten and rearranged, and the figures are modified
- Published
- 2015