Measurement of the spectral function in disordered potentials

July 2017: The IOGS team has developed a method allowing to measure the spectral functions of non-interacting ultra-cold atoms in a three-dimensional disordered potential resulting from an optical speckle field. Varying the disorder strength by two orders of magnitude, they observe the crossover from the "quantum" perturbative regime of low disorder to the "classical" regime...

First measurement of the mobility edge for Anderson localization

June 2015: Building on previous results at CNRS, one of the experimental teams at LENS has measured the mobility edge for Anderson localization using ultracold, non-interacting atoms in 3D disorder created with laser speckles. The mobility edge is a key property of a disordered system, since it is the critical energy separating localized states and...