Transport of ultracold Bose gases beyond the Gross-Pitaevskii description
- Centre for Theoretical Chemistry and Physics and Institute of Natural Sciences, Massey University, Auckland 0745 (New Zealand)
- Institut fuer Theoretische Physik, Universitaet Heidelberg, D-69120 Heidelberg (Germany)
- Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany)
We explore atom-laser-like transport processes of ultracold Bose-condensed atomic vapors in mesoscopic waveguide structures beyond the Gross-Pitaevskii mean-field theory. Based on a microscopic description of the transport process in the presence of a coherent source that models the outcoupling from a reservoir of perfectly Bose-Einstein condensed atoms, we derive a system of coupled quantum evolution equations that describe the dynamics of a dilute condensed Bose gas in the framework of the Hartree-Fock-Bogoliubov approximation. We apply this method to study the transport of dilute Bose gases through an atomic quantum dot and through waveguides with disorder. Our numerical simulations reveal that the onset of an explicitly time-dependent flow corresponds to the appearance of strong depletion of the condensate on the microscopic level and leads to a loss of global phase coherence.
- OSTI ID:
- 21388793
- Journal Information:
- Physical Review. A, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevA.81.013631; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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