Regensburg 2010 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Quantum Chaos
DY 19.15: Vortrag
Mittwoch, 24. März 2010, 18:00–18:15, H38
Transport and weak localisation of Bose-Einstein condensates in two-dimensional billiards — •Timo Hartmann1, Juan Diego Urbina1, Cyril Petitjean1, Klaus Richter1, and Peter Schlagheck2 — 1Institute 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.
Therefore 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 field and of the non-linearity.
A trend towards inversion of the signal of weak localisation
is visible. We discuss the results from a semiclassical point of view.
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).