Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1103/PhysRevA.80.023617

Ключевые слова: Bloch dynamics, Bloch oscillations, Bogoliubov, Bose-Einstein condensates, Chaotic dynamics, Cold atoms, Decoherence, Dinger equation, Dynamical instabilities, Equipartition, Hubbard, Mean-field, Optical lattices, Quantum counterpart, Quasi-one-dimensional, Quasimomentum, Bose-Einstein condensation, Hamiltonians, Nonlinear equations, Steam condensers, Stability

Аннотация: We study the Bloch dynamics of a quasi-one-dimensional Bose-Einstein condensate of cold atoms in a tilted optical lattice modeled by a Hamiltonian of Bose-Hubbard type. The corresponding mean-field system described by a discrete nonlinear Schrodinger equation can exhibit dynamical (or modulation) instability due to chaotic dynamics and equipartition over the quasimomentum modes. It is shown that these phenomena are related to Bogoliubov's depletion of the Bose-Einstein condensate and a decoherence of the condensate in the many-particle description. Three types of dynamics are distinguished: (i) decaying oscillations in the region of dynamical instability and (ii) persisting Bloch oscillations or (iii) periodic decay and revivals in the region of stability.

Журнал: PHYSICAL REVIEW A

Выпуск журнала: Vol. 80, Is. 2

ISSN журнала: 10502947

Место издания: COLLEGE PK

Издатель: AMER PHYSICAL SOC

• Kolovsky A.R. (Siberian Federal University)
• Korsch H.J. (Fachbereich Physik,Technische Universitat Kaiserslautern)
• Graefe E.M. (Fachbereich Physik,Technische Universitat Kaiserslautern)

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