Guillaume Labeyrie, Tomasz Karpiuk, Benoît Grémaud, Christian Miniatura, Dominique Delande
We study experimentally and numerically the quasi-bidimensional transport of a Bose-Einstein condensate (BEC) launched with a wave vector $k_0$ inside an optical disordered potential (speckle). A time-of-flight analysis reveals a pronounced enhanced density peak in the backscattering direction $-k_0$. Numerical simulations indicate that in addition to the coherent backscattering (CBS) effect, a "backscattering echo" (BSE) effect is present due to the high position-momentum correlations of the initial wave packet. A radial integration of the atomic distributions after a finite time of flight allows to recover the CBS peak.
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http://arxiv.org/abs/1206.0845
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