Hannover 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 26: Ultra-cold atoms, ions and BEC II (with Q)
A 26.4: Vortrag
Mittwoch, 2. März 2016, 15:15–15:30, f303
Resonant quantum dynamics of few ultracold bosons in periodically driven finite lattices — •Simeon Mistakidis1, Thomas Wulf1, Antonio Negretti1,2, and Peter Schmelcher1,2 — 1Zentrum fuer Optische Quantentechnologien, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
The out-of-equilibrium dynamics of few ultracold bosons in periodically driven one-dimensional optical lattices is investigated. Our study reveals that the driving enforces the bosons in different wells to oscillate in-phase and to exhibit a dipole-like mode. A wide range from weak-to-strong driving frequencies is covered and a resonance-like behaviour of the intra-well dynamics is discussed [1]. In the proximity of the resonance a rich intraband excitation spectrum is observed. The single particle excitation mechanisms are studied in the framework of Floquet theory elucidating the role of the driving frequency. The impact of the interatomic repulsive interactions is examined in detail yielding a strong influence on the tunneling period and the excitation probabilities. Finally, the dependence of the resonance upon a variation of the tunable parameters of the optical lattice is examined. Our analysis is based on the ab-initio Multi-Configuration Time-Dependent Hartree Method for bosons.
[1] S. I. Mistakidis, T. Wulf, A. Negretti, and P. Schmelcher, J. Phys. B: Atomic, Molecular and Optical Physics, 48(24), 244004 (2015).