Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Quantum Gases: Bosons V
Q 36.2: Vortrag
Mittwoch, 25. März 2015, 11:15–11:30, P/H2
Correlated energy transfer between two ultracold atomic species — •Sven Krönke1, Johannes Knörzer1, and Peter Schmelcher1,2 — 1Centre for Optical Quantumtechnologies, University of Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Germany
We study a single atom as an open quantum system, which is initially prepared in a coherent state of low energy and oscillates in a one-dimensional harmonic trap through an interacting ensemble of NA bosons, held in a displaced trap [1]. The non-equilibrium quantum dynamics of the total system is simulated by means of an ab-initio method, giving us access to all properties of the open system and its finite environment. In this talk, we focus on unravelling the interplay of energy exchange and correlations between the subsystems, which are coupled in such a spatio-temporally localized manner. We show that an inter-species interaction-induced level splitting accelerates the energy transfer between the atomic species for larger NA, which becomes less complete at the same time. System-environment correlations prove to be significant except for times when the excess energy distribution among the subsystems is highly imbalanced. These correlations result in incoherent energy transfer processes, which accelerate the early energy donation of the single atom. By analyzing correlations between intra-subsystem excitations, certain energy transfer channels are shown to be (dis-)favored depending on the instantaneous direction of transfer.
[1] S. Krönke, J. Knörzer and P. Schmelcher. arXiv:1410.8676.