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.

Observation of subdiffusion of a disordered interacting system

Larcher, Marco;Dalfovo, Franco;
2011-01-01

Abstract

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.
2011
106
E., Lucioni; B., Deissler; L., Tanzi; G., Roati; M., Modugno; M., Zaccanti; Larcher, Marco; Dalfovo, Franco; M., Inguscio; G., Modugno
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/88768
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