Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantengase: Bosonen Dynamik / Disorder
Q 17.6: Talk
Tuesday, March 3, 2009, 11:45–12:00, VMP 6 HS-A
Transport and depletion of Bose-Einstein condensates in the presence of disorder — Thomas Ernst1, •Tobias Paul2, and Peter Schlagheck3,4 — 1Center for Theoretical Chemistry and Physics, Massey University Auckland, New Zealand — 2Institut für Theoretische Physik, Universität Heidelberg — 3Institut für Theoretische Physik, Universität Regensburg — 4Division of Mathematical Physics, Lund Institute of Technology, Sweden
We explore transport processes of ultracold Bose-condensed atomic vapors within guided atom lasers beyond the Gross-Pitaevskii Mean-Field approach. For this purpose we generalize the microscopic quantum dynamics approach introduced by Köhler and Burnett to compute the time evolution of the condensate wavefunction as well as the amount of quantum excitations and depletion. Applying this method to flows of ultracold bosonic atoms through quasi 1D waveguides with disorder, we find that the onset of permanently time-dependent scattering of the condensate on the Gross-Pitaevskii level [2,3] corresponds to the appearance of strong depletion of the condensate on the microscopic level.
[1] T. Köhler and K. Burnett, Phys. Rev. A 65, 033601 (2002)
[2] Tobias Paul et al, Phys. Rev. A 72, 063621 (2005)
[3] T. Paul, P. Schlagheck, P. Leboeuf, and N. Pavloff, Phys. Rev. Lett. 98, 210602 (2007)