Quantum depletion of collapsing Bose-Einstein condensates
Date
2007
Authors
Wuester, Sebastian
Dabrowska-Wuster, Beata
Bradley, Adrian J
Davis, Matthew John
Blakie, P. Blair
Hope, Joseph
Savage, Craig
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American Physical Society
Abstract
We perform the first numerical three-dimensional studies of quantum field effects in the Bosenova experiment on collapsing condensates by E. Donley [Nature (London) 415, 39 (2002)] using the exact experimental geometry. In a stochastic truncated Wigner simulation of the collapse, the collapse times are larger than the experimentally measured values. We find that a finite temperature initial state leads to an increased creation rate of uncondensed atoms, but not to a reduction of the collapse time. A comparison of the time-dependent Hartree-Fock-Bogoliubov and Wigner methods for the more tractable spherical trap shows excellent agreement between the uncondensed populations. We conclude that the discrepancy between the experimental and theoretical values of the collapse time cannot be explained by Gaussian quantum fluctuations or finite temperature effects.
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Keywords: Bose-Einstein condensation; Electron energy levels; Electron traps; Gaussian beams; Magnetic field effects; Random processes; Thermal effects; Bosenova experiment; Quantum field effects; Uncondensed atoms; Wigner simulation; Quantum theory
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Physical Review A: Atomic, Molecular and Optical Physics
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Journal article
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2037-12-31
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