Observation of Subdiffusion in a Disordered Interacting System

Year: 2011

Authors: Lucioni E., Deissler B., Tanzi L., Roati G., Zaccanti M., Modugno M., Larcher M., Dalfovo F., Inguscio M., Modugno G.

Autors Affiliation: Univ Florence, LENS, I-50019 Sesto Fiorentino, Italy; Univ Florence, Dipartimento Fis & Astron, I-50019 Sesto Fiorentino, Italy; INO CNR, I-50019 Sesto Fiorentino, Italy; Univ Basque Country, Dept Theoret Phys & Hist Sci, Bilbao 48080, Spain; Basque Fdn Sci, IKERBASQUE, Bilbao 48011, Spain; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy.

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 106 (23)      Pages from: 230403-1  to: 230403-4

More Information: We acknowledge discussions with F. Caruso, C. D’Errico, A. M. Garcia-Garcia, M. Moratti, S. Flach, F. M. Izrailev, S. Lepri, A. Pikovsky, and D. Shepeliansky. This work was supported by EU (IP AQUTE), by ERC through the QUPOL and DISQUA grants and by the ESF and CNR through the EuroQUASAR program.
KeyWords: Anderson Localization; Nonlinear-waves; Delocalization; Transition; Chaos
DOI: 10.1103/PhysRevLett.106.230403

Citations: 126
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