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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.17: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Condensation of bound states and pairs in interacting Fermi gases — •Michael Maennel^1,2, Klaus Morawetz^1,3, Pavel Lipavsky^4,5, and Michael Schreiber² — ¹Department Physical Engineering, Münster University of Applied Science, 48565 Steinfurt, Germany — ²Institute of Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany — ³International Institute of Physics, Universidade Federal do Rio grande do Norte, 59.072-970 Natal-RN, Brazil — ⁴Institute of Physics, Academy of Sciences, 16253 Prague 6, Czech Republic — ⁵Faculty of Mathematics and Physics, Charles University, 12116 Prague 2, Czech Republic

We investigate a Fermi gas with finite-range interaction using a scheme to eliminate self interaction in the T-matrix approximation. In this way the corrected T-matrix becomes suitable to calculate properties below the critical temperature, without the use of anomalous functions. We calculate the phase diagram, excitation spectrum and equation of state. While in the low-density limit we find a condensation of bound states, for high density there is pairing. In between there is the BCS-BEC crossover.