Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Ultra-cold atoms, ions and BEC (with A)
Q 12.9: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Regions of tunneling dynamics for few bosons in an optical lattice subjected to a quench of the imposed harmonic trap — •Georgios Koutentakis1,2, Simeon Mistakidis1, and Peter Schmelcher1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany
Recent advancements in ultracold atom experiments have introduced an interplay in the trapping length scales of lattice and harmonic confinement. This fact motivates the investigation, whether it is possible to prepare atomic gases at certain quantum states by utilizing a composite atomic trap consisting of a lattice potential that is embedded inside an overlying harmonic trap. In the present work, we examine how frequency modulations of the harmonic trap stimulate the dynamics of an 1D few-boson gas. The gas is initially prepared at a highly confined state, and the subsequent dynamics induced by a quench of the harmonic trap frequency to a lower value is examined. It is shown that a non-interacting gas always diffuses to the outer sites, whereas the response of the interacting system is more involved and is dominated by a resonance, which is induced by the bifurcation of the low-lying eigenstates. Our study reveals that the position of the resonance depends both on the atom number and the interaction coupling, manifesting its many body nature. A corresponding mean field treatment as well as a single-band approximation have been found to be inadequate for the description of the tunneling dynamics in the interacting case.