Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials |
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Authors: | Hartung Michael Wellens Thomas Müller Cord A Richter Klaus Schlagheck Peter |
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Institution: | Institut für Theoretische Physik, Universit?t Regensburg, 93040 Regensburg, Germany. |
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Abstract: | 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. |
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