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28 March 2024
 
  » arxiv » 1011.0296

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Growth dynamics of a Bose-Einstein condensate in a dimple trap without cooling
Michael C. Garrett ; Adrian Ratnapala ; Eikbert D. van Ooijen ; Christopher J. Vale ; Kristian Weegink ; Sebastian K. Schnelle ; Otto Vainio ; Norman R. Heckenberg ; Halina Rubinsztein-Dunlop ; Matthew J. Davis ;
Date 1 Nov 2010
AbstractWe study the formation of a Bose-Einstein condensate in a cigar-shaped three-dimensional harmonic trap, induced by the controlled addition of an attractive "dimple" potential along the weak axis. In this manner we are able to induce condensation without cooling due to a localized increase in the phase space density. We perform a quantitative analysis of the thermodynamic transformation in both the sudden and adiabatic regimes for a range of dimple widths and depths. We find good agreement with equilibrium calculations based on self-consistent semiclassical Hartree-Fock theory describing the condensate and thermal cloud. We observe there is an optimal dimple depth that results in a maximum in the condensate fraction. We also study the non-equilibrium dynamics of condensate formation in the sudden turn-on regime, finding good agreement for the observed time dependence of the condensate fraction with calculations based on quantum kinetic theory.
Source arXiv, 1011.0296
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