C. D'Errico, M. Moratti, E. Lucioni, L. Tanzi, B. Deissler, M. Inguscio, G. Modugno, M. B. Plenio, F. Caruso
Disorder, noise, and interactions play a crucial role in the transport properties of quantum systems, but they are typically hard to control. Here, we explore the impact of controlled noise on the transport of ultracold bosons with tunable interaction in a quasiperiodic lattice. In the absence of interactions, we observe breaking of Anderson localization and the onset of normal diffusion, in agreement with general models for time-dependent disorder. When a repulsive or attractive interaction is included, we observe an enhanced anomalous diffusion driven by an additive cooperation of noise and interaction. The experiments are compared with extensive numerical simulations, which reveal also a more complex interplay between localization due to interaction and delocalization due to noise in the strong interaction regime.
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http://arxiv.org/abs/1204.1313
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