Observation of Subdiffusion in a Disordered Interacting System

Anno: 2011

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

Affiliazione autori: 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.

Giornale/Rivista: PHYSICAL REVIEW LETTERS

Volume: 106 (23)      Da Pagina: 230403-1  A: 230403-4

Maggiori informazioni: 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.
Parole chiavi: Anderson Localization; Nonlinear-waves; Delocalization; Transition; Chaos
DOI: 10.1103/PhysRevLett.106.230403

Citazioni: 130
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-11
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