Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials.
We study quantum transport of an interacting Bose-Einstein condensate in a two-dimensional disorder potential. In the limit of a vanishing atom-atom interaction, a sharp cone in the angle-resolved density of the scattered matter wave is observed, arising from constructive interference between amplitudes propagating along reversed scattering paths. Weak interaction transforms this coherent backscattering peak into a pronounced dip, indicating destructive instead of constructive interference. We reproduce this result, obtained from the numerical integration of the Gross-Pitaevskii equation, by a diagrammatic theory of weak localization in the presence of nonlinearity.
Hartung
Michael
M
Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany.
Wellens
Thomas
T
Müller
Cord A
CA
Richter
Klaus
K
Schlagheck
Peter
P