BCS-BEC crossover and polaron-to-molecule transition in strongly interacting Fermi gases.

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• Matthias Punk, TU Munich
• Tuesday 19 October 2010, 11:00-12:00
• Mott Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Dr G Moller.

The experimental realization of ultracold quantum gases triggered a new theoretical interest in basic many body systems, which have not been realized in nature previously. One example of a fundamental many body problem that is now experimentally accessible for the first time is the so called BCS -BEC crossover from weakly bound Cooper pairs to a Bose-Einstein condensate of strongly bound molecules in attractively interacting, two-component Fermi gases. In this talk I will give a brief introduction to the BCS -BEC crossover, show recent theoretical results on single particle spectral functions and discuss the controversial issue of a possible pseudogap behavior in the strongly interacting system above Tc. Moreover, I will show how a slight generalization of this model to a situation with a population imbalance between the two Fermionic species gives rise to a rich phase diagram that is poorly understood from a theoretical point of view. In particular I’m going to discuss the seemingly simple limit of a single “down-spin” interacting with a Fermi-sea of “up-spins”.

This talk is part of the TCM Informal Seminar Series series.

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• Mott Seminar Room, Cavendish Laboratory

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