Experimental studies of Bose–Einstein condensates in disorder

We review recent studies of the effects of disorder on an atomic Bose–Einstein condensate (BEC). We focus particularly on our own experiments with 7Li BECs in laser speckle. Both the interaction, which gives rise to the nonlinearity in a BEC, and the disorder can be tuned experimentally. This opens many opportunities to study the interplay of interaction and disorder in both condensed matter physics and nonlinear science.