Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials

Details Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials

2008-04-23

arxiv.org/abs/0804.3723v1

Phys. Rev. Lett. 101, 020603 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.020603

We study quantum transport of an interacting Bose-Einstein condensate in a two-dimensional disorder potential. In the limit of 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 presence of a nonlinearity.

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