Berlin 2005 – wissenschaftliches Programm

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A: Atomphysik

A 15: Cold Atoms; Ultra-cold Atoms; and Atoms in Traps; BEC; I

A 15.4: Fachvortrag

Dienstag, 8. März 2005, 17:30–17:45, HU 3094

Bloch oscillations of Bose-Einstein condensates: Breakdown and revival — •Dirk Witthaut, Mauro Werder, Stefan Mossmann, and Hans Jürgen Korsch — Fachbereich Physik, TU Kaiserslautern

We investigate the dynamics of Bose-Einstein condensates (BEC) in a tilted one-dimensional periodic lattice within the mean-field (Gross-Pitaevskii) description.

For weak static fields a BEC carries out Bloch oscillations well-known from the linear case. However, one observes a breakdown of the oscillations due to nonlinear dephasing and pronounced revival phenomena. Breakdown and revival can be explained with an integrable model constructed by an expansion in Wannier-Stark resonance states.

For stronger static fields the system shows a pulsed output, whereas the nonlinearity characteristically deforms the pulses.