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- Growth dynamics of a Bose-Einstein condensate in a dimple trap without cooling
- Garrett, Michael C.; Ratnapala, Adrian; Van Ooijen, Eikbert D.; Vale, Christopher J.; Weegink, Kristian; Schnelle, Sebastian K.; Vainio, Otto; Heckenberg, Norman R.; Rubinsztein-Dunlop, Halina; Davis, Matthew J.
- We 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 that there is an optimal dimple depth that results in a maximum in the condensate fraction. We also study the nonequilibrium 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.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
- Physical Review A: Atomic, Molecular, and Optical Physics, Vol. 83, no. 1 (Jan 2011), article no. 013630
- Publication year
- FOR Code(s)
- 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0204 Condensed Matter Physics; 0205 Optical Physics
- Bose-Einstein condensates; Condensate formation; Condensate growth; Dimples; Temperature; Thermodynamics
- American Physical Society
- Publisher URL
- Copyright © 2011 American Physical Society. The published version of the paper is reproduced here with the kind permission of the publisher.
- Research Projects
Quantum atom optics and single atom detection with micro-Bose-Einstein condensates, Australian Research Council grant number DP0343094
Superfluidity and metrology with ring shaped Bose Einstein condensates, Australian Research Council grant number DP0985142
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