Transport of ultracold Bose gases beyond the Gross-Pitaevskii description

• Verfasst von: Ernst, Thomas [VerfasserIn]
• Verfasst von: Paul, Tobias [VerfasserIn]
• Verfasst von: Schlagheck, Peter [VerfasserIn]
• Titel: Transport of ultracold Bose gases beyond the Gross-Pitaevskii description
• Verf.angabe: Thomas Ernst, Tobias Paul, and Peter Schlagheck
• E-Jahr: 2010
• Jahr: 29 January 2010
• Umfang: 12 S.
• Fussnoten: Gesehen am 03.04.2023
• Titel Quelle: Enthalten in: Physical review / A
• Ort Quelle: College Park, Md., 1970
• Jahr Quelle: 2010
• Band/Heft Quelle: 81(2010), 1 vom: Jan., Artikel-ID 013631, Seite 1-12
• ISSN Quelle: 1094-1622
• DOI: doi:10.1103/PhysRevA.81.013631
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1841030392

Abstract

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.