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          Institute: MPI für Dynamik und Selbstorganisation     Collection: Nichtlineare Dynamik     Display Documents



ID: 673691.0, MPI für Dynamik und Selbstorganisation / Nichtlineare Dynamik
Nature of self-localization of Bose-Einstein condensates in optical lattices
Authors:Hennig, Holger; Fleischmann, Ragnar
Language:English
Date of Publication (YYYY-MM-DD):2013-03-05
Title of Journal:Physical Review A
Volume:87
Issue / Number:3
Sequence Number of Article:033605
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We analyze the nature of self-localization (SL) of Bose-Einstein condensates in one-dimensional optical lattices in the presence of weak local dissipation. SL has recently been observed in several studies based on the discrete nonlinear Schrödinger equation (DNLS); however, its origin is hitherto an open question. We show that SL is based on a self-trapping crossover in the system. Furthermore, we establish that the origin of the crossover is the Peierls-Nabarro barrier, an energy threshold describing the stability of self-trapped states. Beyond the mean-field description the crossover becomes even sharper, which is also reflected by a sudden change of the coherence of the condensate. While we expect that the crossover can be readily studied in current experiments in deep optical lattices, our results allow for the preparation of robust and long-time coherent quantum states.
External Publication Status:published
Document Type:Article
Communicated by:Folkert Müller-Hoissen
Affiliations:MPI für Dynamik und Selbstorganisation/Nichtlineare Dynamik
External Affiliations:Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
Identifiers:DOI:10.1103/PhysRevA.87.033605
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