Robert-de-Saint-Vincent, M.Brantut, Jean-PhilippeAllard, B.Plisson, T.Pezze, L.Sanchez-Palencia, L.Aspect, A.Bourdel, T.Bouyer, P.2017-03-162017-03-162017-03-16201010.1103/PhysRevLett.104.220602https://infoscience.epfl.ch/handle/20.500.14299/135400We 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.text::journal::journal article::research article