title: Berry phase in magnetic superconductors.
abstract: In magnetic systems, electronic bands often acquire nontrivial topological structure characterized by gauge flux distribution in momentum k space. It sometimes follows that the phase of the wave functions cannot be defined uniquely over the whole Brillouin zone. In this Letter, we develop a theory of superconductivity in the presence of this gauge flux both in two- and three-dimensional systems. It is found that the superconducting gap has "nodes" as a function of k where the Fermi surface is penetrated by a gauge string.
authors.affiliation: Department of Applied Physics, University of Tokyo, Bunkyo-ku, Japan. murakami@appi.t.u-tokyo.ac.jp
authors.forename: Shuichi
authors.initials: S
authors.lastname: Murakami
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa