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Dresden 2011 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 35: ISS Transport and Localization of interacting Bosons II

DY 35.4: Vortrag

Donnerstag, 17. März 2011, 15:15–15:30, BAR Schön

Weak (anti-)localization of Bose-Einstein condensates in two-dimensional chaotic cavities: numerical results — •Timo Hartmann1, Juan Diego Urbina1, Klaus Richter1, and Peter Schlagheck21Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany — 2Département de Physique, Université de Liège, 4000 Liège, Belgium

The possibility to induce artificial magnetic gauge potentials for matter waves [1] and to create almost arbitrarily shaped confinement potentials [2] makes it now interesting and feasible to study coherent transport of Bose-Einstein condensates through various mesoscopic structures. Previous theoretical studies have focused on the question how coherent backscattering in disordered potentials is modified by the presence of the atom-atom interaction [3]. We now study the analogous scenario of weak localisation in ballistic billiard geometries which exhibit chaotic classical dynamics. To this end we numerically investigate the quasi-stationary propagation of a condensate through such structures within the mean-field approximation. The transmission is measured as a function of the magnetic gauge field and of the non-linearity. With increasing non-linearity an inversion of the weak-localisation peak is visible and its origin will be discussed.
Y.-J. Lin et al., Phys. Rev. Lett. 102 130401 (2009)
K. Henderson et al., New J. Phys. 11, 043030(2009)
M. Hartung et al., Phys. Rev. Lett. 101, 020603 (2008).

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