Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 26: Quantengase: Fermionen

Q 26.4: Talk

Tuesday, March 3, 2009, 17:15–17:30, VMP 6 HS-A

Freaky phase from frosty fermions: a geometric phase in BCS-BEC crossover — •Bernhard M. Breid and James R. Anglin — Technische Universität Kaiserslautern, Germany

The formation of a molecular Bose-Einstein condensate (BEC) from a BCS state of fermionic atoms as a result of slow sweeping through a Feshbach resonance is analyzed. We apply a path integral approach using adiabatic approximations to solve for an effective action for the molecules. The non-standard aspects of the resulting effective action and its effect on semiclassical dynamics are discussed. Considering this time-dependent process as an analogue of the cosmological Zurek scenario, we compare the way condensate growth is driven in this rigorous theory with its phenomenological description via time-dependent Ginzburg-Landau theory.

[1] B. M. Breid and J. R. Anglin, Phil. Trans. R. Soc. A (2008) 366, 2813-2820