Strong coupling theory for the superfluidity of Bose-Fermi mixtures

Details Strong coupling theory for the superfluidity of Bose-Fermi mixtures Strong coupling theory for the superfluidity of Bose-Fermi mixtures

2006-02-08

arxiv.org/abs/cond-mat/0602201v2

Phys. Rev. Lett. 96, 140404 (2006)

Physics

Condensed Matter

Other Condensed Matter

4 pages and 3 figures

Scientific paper

10.1103/PhysRevLett.96.140404

We develop a strong-coupling theory for the superfluidity of fermion pairing phase in a Bose-Fermi mixture. Dynamical screening, self-energy renormalization, and a pairing gap function are included self-consistently within the adiabatic limit (i.e., the phonon velocity is much smaller than the Fermi velocity). An analytical solution for the transition temperature (Tc) is derived within reasonable approximations. Using typical parameters of a 40K-87Rb mixture, we find that the calculated Tc is several times larger than that obtained in the weak coupling theory, and can be up to several percents of the Fermi temperature.

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