Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 14: Nichtlineare Optik & Atomoptik
Q 14.1: Vortrag
Samstag, 5. März 2005, 08:30–08:45, HU 2002
Resonant ballistic quantum transport with periodically kicked cold and ultracold atomic gases — •Sandro Marcel Wimberger1, Ennio Arimondo1, Riccardo Mannella1, Roberto Artuso2, and Mark Sadgrove3 — 1Dipartimento di Fisica "E. Fermi", Universita degli Studi di Pisa, Via Buonarroti 2, I-56127 Pisa — 2Universita degli Studi dell’ Insubria, Via Valleggio 11, I-22100 Como — 3University of Auckland, Private Bag 92019, Auckland, New Zealand
An overview of recent experiments and theoretical results on the dynamics of periodically kicked cold atomic gases is presented. The atom-optics realization of the paradigmatic Kicked Rotor shows much richer dynamical properties than previously expected. For vanishing kick periods, ballistic quantum transport can for the first time be realized. This allows one to experimentally create fast (ballistic) and slow (localized) mean atomic momenta on demand. Resonant ballistic dynamics is predicted to be even better realizable using a Bose condensate with plane wave like initial conditions (σp ≪ 2 ℏ kL). Nonlinear interactions of the Gross-Pitaevskii type are shown to perturb the resonant motion of a strongly 3D-confined condensate. Hence, experiments with systems governed by atom-atom interactions and appropriately chosen external spatially and temporally periodic optical potentials offer a variety of tools to measure, for instance, the nonlinear coupling constants. Moreover, they open a route to study interaction-induce decoherence of phase sensitive coherent dynamics, and higher dimensional chaos with exceptional experimental control.