Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

[en] 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.

Disciplines :

Physics

Author, co-author :

Ernst, Thomas

Paul, Tobias

Schlagheck, Peter ; Université de Liège - ULiège > Département de physique > Physique quantique statistique

Language :

English

Title :

Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

Publication date :

2010

Journal title :

Physical Review. A, General Physics

ISSN :

0556-2791

Publisher :

American Physical Society

Volume :

Issue :

Pages :

013631

Peer reviewed :

Peer reviewed

Available on ORBi :

since 05 November 2010

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2 (2 by ULiège)

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