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Anisotropic 2D diffusive expansion of ultra-cold atoms in a disordered potential

Abstract : We study the horizontal expansion of vertically confined ultra-cold atoms in the presence of disorder. Vertical confinement allows us to realize a situation with a few coupled harmonic oscillator quantum states. The disordered potential is created by an optical speckle at an angle of 30{\deg} with respect to the horizontal plane, resulting in an effective anisotropy of the correlation lengths of a factor of 2 in that plane. We observe diffusion leading to non-Gaussian density profiles. Diffusion coefficients, extracted from the experimental results, show anisotropy and strong energy dependence, in agreement with numerical calculations.
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https://hal.archives-ouvertes.fr/hal-00470303
Contributor : Martin Robert-De-Saint-Vincent Connect in order to contact the contributor
Submitted on : Tuesday, April 6, 2010 - 9:36:14 AM
Last modification on : Sunday, June 26, 2022 - 11:51:38 AM

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Martin Robert-De-Saint-Vincent, Jean-Philippe Brantut, Baptiste Allard, Thomas Plisson, Luca Pezzé, et al.. Anisotropic 2D diffusive expansion of ultra-cold atoms in a disordered potential. Physical Review Letters, American Physical Society, 2010, 104 (22), pp.220602. ⟨10.1103/PhysRevLett.104.220602⟩. ⟨hal-00470303⟩

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