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We consider the BCS-BEC crossover for a system of trapped Fermi atoms at
finite temperature in the superfluid phase.
The fermionic system is described by a single-particle self-energy that
includes pairing-fluctuation effects in the superfluid phase.
The theory reduces to the Popov theory for dilute superfluid fermions for
weak coupling and to the Bogoliubov approximation for the composite
bosons for strong coupling (where bosonic molecules form as bound-fermion
pairs). Comparison of the results of our theory with experiments on cold
trapped Fermi atoms as well as with recent QMC simulations will be presented.
References [1] P. Pieri, L. Pisani, and G.C. Strinati, cond-mat/0406099, to appear in Phys. Rev. B. [2] P. Pieri, L. Pisani, and G.C. Strinati, Phys. Rev. Lett. 92, 110401 (2004). [3] A. Perali, P. Pieri, L. Pisani, and G.C. Strinati, Phys. Rev. Lett. 92, 220404 (2004). [4] A. Perali, P. Pieri, and G.C. Strinati, cond-mat/0405102. |