Functional renormalization group for d-wave superconductivity in Hubbard type models
H. C. Krahl, C. Wetterich
Abstract
The temperature dependence of d-wave superconducting order for two dimensional fermions with d-wave attraction is investigated by means of the functional renormalization group with partial bosonization. Below the critical temperature Tc we find superconductivity, a gap in the electron propagator and a temperature dependent anomalous dimension. At Tc the renormalized "superfluid density" jumps and the approach to Tc from above is characterized by essential scaling. These features are characteristic for a phase transition of the Kosterlitz-Thouless (KT) type.
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