Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.37: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.I+II

Functional Renormalization Group Approach to the BCS-BEC Crossover — •Carlo Krimphoff and Lorenz Bartosch — Institut für Theoretische Physik, Goethe-Universität Frankfurt

The BCS-BEC crossover in two-component Fermi gases with short-range attraction has been, up to now, a subject of great interest. Besides recent experimental progress, a wide variety of methods has been used to address this problem theoretically, ranging from qualitative mean field approaches to quantum Monte Carlo simulations and various non-perturbative many-body methods.

In this work, we investigate the BCS-BEC crossover in three dimensions by means of a functional renormalization group approach with bosonization in the particle-particle channel. Going beyond previous approximation schemes by keeping the full momentum and frequency structure of the bosonic propagator, we calculate the effect of order parameter fluctuations on the chemical potential and the order parameter of the system and compare it to documented data from previous calculations.