Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.71: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Inelastic scattering of a probe particle on a Bose-Einstein condensate — •Stefan Hunn1, Moritz Hiller1, Tsampikos Kottos2, Doron Cohen3, and Andreas Buchleitner1 — 1Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — 2Department of Physics, Wesleyan University, CT, USA — 3Department of Physics, Ben-Gurion University, Beer-Sheva, Israel
We devise a microscopic scattering approach to probe the excitation spectrum of a Bose-Einstein condensate: A probe particle with momentum k moves in a waveguide which is placed in the proximity of a BEC confined by an optical lattice. When the particle approaches the condensate, it exchanges energy with the latter. We investigate the statistical properties of the resulting inelastic scattering process. In the parameter regime where the inter-atomic interactions induce chaotic spectral statistics, the inelastic cross section exhibits universal Ericson fluctuations. On the other hand, we show how a mixed regular/chaotic phase space of the underlying mean-field dynamics is reflected in the sparsity of the scattering matrix.