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Q: Quantenoptik und Photonik

Q 75: Kurzvorträge zum Symposium Mesoskopische Physik ultrakalter Atome (SYUA)

Q 75.3: Talk

Wednesday, March 9, 2005, 16:30–16:45, HU Audimax

Density correlations in ultracold Fermi gases at the BEC-BCS transition — •Christian Schroll, Wolfgang Belzig, and Christoph Bruder — Universität Basel, Department fuer Physik, Klingelbergstr. 82, 4056 Basel, Schweiz

We use the method of full counting statistics, successfully applied in quantum optics and mesoscopic transport, to study the BEC-BCS crossover. This method allows us to investigate the density fluctuations as well as higher-order correlations. Based on the BCS-wavefunction ansatz for the crossover [1], we find a smooth transition from Poissonian statistics in the BEC regime to binomial statistics in the BCS regime. Finite temperature effects on the statistics are discussed.

[1] A. J. Leggett, in Modern Trends in the Theory of Condensed Matter, edited by A. Pedalski and J. Przystawa (Springer, Berlin, 1980).