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Q: Fachverband Quantenoptik und Photonik

Q 11: Quantum Gases: Fermions II

Q 11.1: Gruppenbericht

Montag, 23. März 2015, 14:30–15:00, K/HS2

Phases of unitary imbalanced Fermi gases — •Dietrich Roscher — Institut fuer Kernphysik, Technische Universitaet Darmstadt

Apart from being interesting in their own right, "unitary" ultracold Fermi gases are receiving growing attention due to their similarity to low-energy models of QCD, such as NJL-type models. The strongly coupled nature of both systems poses a challenge to theoretical methods that is additionally complicated by deformations such as the baryon chemical potential in QCD or population and/or mass imbalance for ultracold gases, respectively. On the other hand, these modifications are prerequisites for the emergence of exotic phases associated with, e.g., a spontaneous breakdown of translational invariance. In order to gain insight into these realms, we apply functional renormalization group (FRG) techniques to the three-dimensional Fermi gas at infinite s-wave scattering length with population and mass imbalance. The resulting phase diagram will be discussed with special emphasis on the exploration of phases with broken translational invariance. Being not limited to the mean-field approximation, FRG also provides a way to test the stability and/or distortion of the phase structure upon inclusion of fluctuation effects.