Observation of subdiffusion of a disordered interacting system

Details Observation of subdiffusion of a disordered interacting system Observation of subdiffusion of a disordered interacting system

2010-11-10

arxiv.org/abs/1011.2362v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages, to be published on Physical Review Letters

Scientific paper

We study the transport dynamics of matter-waves in the presence of disorder and nonlinearity. An atomic Bose-Einstein condensate that is localized in a quasiperiodic lattice in the absence of atom-atom interaction shows instead a slow expansion with a subdiffusive behavior when a controlled repulsive interaction is added. The measured features of the subdiffusion are compared to numerical simulations and a heuristic model. The observations confirm the nature of subdiffusion as interaction-assisted hopping between localized states and highlight a role of the spatial correlation of the disorder.

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