Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2010

Идентификатор DOI: 10.1103/PhysRevA.81.025603

Ключевые слова: Atomic Bose-Einstein condensate, Bloch oscillations, Bose-Einstein condensates, Configuration space, Dinger equation, Dynamical phenomena, Fractional revivals, Mean field approximation, Momentum spaces, Optical lattices, Static fields, Strong field, Nonlinear equations, Statistical mechanics, Steam condensers, Dynamics

Аннотация: The dynamics of a (quasi-) one-dimensional interacting atomic Bose-Einstein condensate in a tilted optical lattice is studied in a discrete mean-field approximation, i.e., in terms of the discrete nonlinear Schrodinger equation. If the static field is varied, the system shows a plethora of dynamical phenomena. In the strong field limit, we demonstrate the existence of (almost) nonspreading states which remain localized on the lattice region populated initially and show coherent Bloch oscillations with fractional revivals in the momentum space (so-called quantum carpets). With decreasing field, the dynamics becomes irregular, however, still confined in configuration space. For even weaker fields, we find subdiffusive dynamics with a wave-packet width growing as t(1/4).

Журнал: PHYSICAL REVIEW A

Выпуск журнала: Vol. 81, Is. 2

ISSN журнала: 10502947

Место издания: COLLEGE PK

Издатель: AMER PHYSICAL SOC

• Kolovsky Andrey R. (LV Kirenskii Inst Phys, RU-660036 Krasnoyarsk, Russia; Siberian Fed Univ, RU-660036 Krasnoyarsk, Russia)
• Gomez Edgar A. (Tech Univ, Fachbereich Phys, D-67653 Kaiserslautern, Germany; Univ Nacl Colombia, Dept Fis, Bogota, Colombia)
• Korsch Hans Juergen (Tech Univ, Fachbereich Phys, D-67653 Kaiserslautern, Germany)

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