Observation of Subdiffusion in a Disordered Interacting System
Authors: Lucioni E., Deissler B., Tanzi L., Roati G., Zaccanti M., Modugno M., Larcher M., Dalfovo F., Inguscio M., Modugno G.
Autors Affiliation: LENS and Dipartimento di Fisica e Astronomia, Universita\’ di Firenze, and INO-CNR, 50019 Sesto Fiorentino, Italy; Department of Theoretical Physics and History of Science, UPV-EHU, 48080 Bilbao, Spain; IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain; INO-CNR BEC Center and Dipartimento di Fisica, Universita\’ di Trento, 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 to: 230403
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: Atom-atom interaction; Atomic Bose-Einstein condensate; Heuristic model; Interacting system; Localized state; Non-Linearity; Quasi-periodic lattices; Repulsive interactions; Spatial correlations; Subdiffusion; Subdiffusive behavior; Transport dynamics, Computer simulation; Statistical mechanics; Steam condensers, Atoms; Ultracold atoms; disordered potentials; Anderson localization; Nonlinear-waves; LatticesDOI: 10.1103/PhysRevLett.106.230403Citations: 87data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2019-09-15References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here