Berry phase in Magnetic Superconductors

Details Berry phase in Magnetic Superconductors Berry phase in Magnetic Superconductors

2002-08-30

arxiv.org/abs/cond-mat/0209001v2

Phys. Rev. Lett. 90, 057002 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, substantial changes in the presentation, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.057002

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 wavefunctions 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.

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