Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster Quantengase
Q 64.7: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
Precision measurements of collective oscillations in the BEC-BCS crossover regime — •Alexander Altmeyer1, Stefan Riedl1,2, Christoph Kohstall1, Matthew J. Wright1, Edmundo R. Sanchez1, Johannes Hecker Denschlag1, and Rudolf Grimm1,2 — 1Institut für Experimentalphysik, Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften
Experiments with ultracold
fermionic atoms in the vicinity of a magnetic Feshbach resonance
recently entered the crossover regime between Bose-Einstein
condensation (BEC) and Bardeen-Cooper-Schrieffer superfluidity
(BCS). The long lifetime of pairs of two fermionic atoms makes such
a system ideal for experimental studies. We present precision
experiments of collective oscillations and provide detailed
quantitative insights into this BEC-BCS crossover regime1. At
any point in the crossover regime the equation of state and the
density dependence of the chemical potential of the system can be
determined by measuring the normalized frequencies of compression
modes. Our measurements are in agreement with a quantum Monte Carlo
simulation including hydrodynamic theory in the local density
approximation and rule out simple mean-field BCS
approaches.
[1] A.Altmeyer et. al.,
arXiv.org/abs/cond-mat/0611285, 2006, accepted for publication in
PRL.