Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.91: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Collisions of ultracold fermionic molecules: Averaged rates and state-changing collisions — •A. Pikovski1, M. Klawunn2, A. Recati2, and L. Santos1 — 1Institut für theoretische Physik, Leibniz Universität Hannover, Germany — 2INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, Italy
At very low temperatures, effects of quantum statistics play an important role in interparticle collisions. We study ensemble-averaged collision rates for a two-component gas of fermions, with possibly different masses, particle densities, and temperatures, for general two-body collisions. The results give an understanding of how the experimentally measured rates depend on the system parameters. [arXiv:1211.6613]
A concrete example of ultracold collisions are state-changing collisions in ultracold polar molecules in a bilayer geometry. If the molecules in each layer are initially prepared in a different rotational state, we show that the inter-layer dipole-dipole interaction induces a swap of the rotational state of molecules in different layers in two-body collisions. Remarkably, for optically trapped highly reactive molecules like KRb, such state swaps lead to losses by chemical reactions, and hence the state-changing collisions can be observed by monitoring the molecule number. [Phys. Rev. A 84, 061605(R) (2011)]