Anisotropic 2D Diffusive Expansion of Ultracold Atoms in a Disordered Potential
Martin Robert-De-Saint-VincentLaboratoire Charles Fabry de l'Institut d'Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau, FranceJean-Philippe BrantutLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceBaptiste AllardLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceThomas PlissonLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceLuca PezzèLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceLaurent Sanchez-PalenciaLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceA. AspectLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FranceThomas BourdelLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau FrancePhilippe BouyerLaboratoire Charles Fabry de l’Institut d’Optique, Univ. Paris Sud, CNRS, campus polytechnique RD128, 91127 Palaiseau France
2010en
ABI
Annotatsiya
We study the horizontal expansion of vertically confined ultracold 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° 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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