title: Functional renormalization-group study of the pairing symmetry and pairing mechanism of the FeAs-based high-temperature superconductor.
abstract: We apply the fermion functional renormalization-group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure repulsive interactions, we find an electronic-driven superconducting pairing instability. For the doping and interaction parameters we have examined, extended s wave, whose order parameter takes on opposite sign on the electron and hole pockets, is always the most favorable pairing symmetry. The pairing mechanism is the inter-Fermi-surface Josephson scattering generated by the antiferromagnetic correlation.
authors.affiliation: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: Fa
authors.initials: F
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Zhai
authors.forename: Ying
authors.initials: Y
authors.lastname: Ran
authors.forename: Ashvin
authors.initials: A
authors.lastname: Vishwanath
authors.forename: Dung-Hai
authors.initials: DH
authors.lastname: Lee