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Q: Fachverband Quantenoptik und Photonik
Q 12: Ultra-cold atoms, ions and BEC (with A)
Q 12.10: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Cradle-like processes and mode-coupling of interaction quenched ultracold bosons in periodically driven lattices — •Simeon Mistakidis1 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 ultracold bosons in one-dimensional lattices following an interaction quench upon a periodically driven optical latttice is investigated. It is shown that an interaction quench triggers the inter-well tunneling dynamics, while for the intra-well dynamics breathing and cradle-like processes can be generated. In particular, the occurence of a resonance between the cradle and tunneling modes is revealed. On the other hand, the employed periodic driving (vibration) enforces the bosons in the mirror wells to oscillate out-of-phase and to exhibit a dipole mode, while in the central well the cloud experiences a breathing mode. The dynamical behaviour of the system is investigated with respect to the driving frequency revealing a resonant-like behaviour of the intrawell dynamics. To drive the system in a highly non-equilibrium situation an interaction quench upon the driving is performed giving rise to admixing of excitations in the mirror wells, an enhanced breathing in the center and an amplification of the tunneling dynamics. As a result of the quench the system experiences multiple resonances between the inter- and intra-well dynamics at different quench amplitudes.