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TT: Fachverband Tiefe Temperaturen
TT 11: Poster Session: Matter at Low Temperature
TT 11.17: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Condensation of bound states and pairs in interacting Fermi gases — •Michael Maennel1,2, Klaus Morawetz1,3, Pavel Lipavsky4,5, 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.