Localization in momentum space of ultracold atoms in incommensurate lattices

Year: 2011

Authors: Larcher M., Modugno M., Dalfovo F.

Autors Affiliation: Istituto Nazionale di Ottica CNR BEC Center and Dipartimento di Fisica, Università di Trento, 38123 Povo, Italy;
Department of Theoretical Physics and History of Science, Universidad del Pais Vasco-Euskal Herriko Unibertsitatea (UPV-EHU), 48080 Bilbao, Spain;
IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.

Abstract: We characterize the disorder-induced localization in momentum space for ultracold atoms in one-dimensional incommensurate lattices, according to the dual Aubry-Andre model. For low disorder the system is localized in momentum space, and the momentum distribution exhibits time-periodic oscillations of the relative intensity of its components. The behavior of these oscillations is explained by means of a simple three-mode approximation. We predict their frequency and visibility by using typical parameters of feasible experiments. Above the transition the system diffuses in momentum space, and the oscillations vanish when averaged over different realizations, offering a clear signature of the transition.

Journal/Review: PHYSICAL REVIEW A

Volume: 83 (1)      Pages from: 13624-1  to: 13624-5

More Information: M.M. acknowledges support from INO-CNR through the DQS EuroQUAM project from ESF. This work is also supported by Miur.
KeyWords: Anderson Localization; Insulator
DOI: 10.1103/PhysRevA.83.013624

Citations: 19
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