Collapse and revival of the monopole mode of a degenerate Bose gas in an isotropic harmonic trap

C.J.E. Straatsma, V.E. Colussi, M.J. Davis, D.S. Lobser, M.J. Holland, D.Z. Anderson, H.J. Lewandowski, E.A. Cornell

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Abstract

We study the monopole (breathing) mode of a finite temperature Bose-Einstein condensate in an isotropic harmonic trap recently developed by Lobser [Nat. Phys. 11, 1009 (2015)1745-247310.1038/nphys3491]. We observe a nonexponential collapse of the amplitude of the condensate oscillation followed by a partial revival. This behavior is identified as being due to beating between two eigenmodes of the system, corresponding to in-phase and out-of-phase oscillations of the condensed and noncondensed fractions of the gas. We perform finite temperature simulations of the system dynamics using the Zaremba-Nikuni-Griffin methodology [J. Low Temp. Phys. 116, 277 (1999)10.1023/A:1021846002995], and find good agreement with the data, thus confirming the two mode description.

Original languageEnglish
Article number043640
Number of pages13
JournalPhysical Review A
Volume94
Issue number4
DOIs
Publication statusPublished - 24 Oct 2016
Externally publishedYes

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