Amperean pairing mediated by magnetic fluctuations at the surface of a topological insulator

ORAL

Abstract

We study the interface between a three-dimensional topological insulator and a ferromagnetic thin film. Due to the Dirac nature of surface states, in-plane magnetization couples to them as a gauge field, leading to emergent electric and magnetic fields. We argue that magnetic fluctuations mediate strongly anisotropic interaction and can be the origin of an unconventional superconductivity with Amperean pairings.

–

Authors

  • Mehdi Kargarian

    Department of Physics, University of Maryland, College Park, Maryland 20742, Department of Physics, University of Maryland, College Park, MD 20742

  • Dmitry K. Efimkin

    Joint Quantum Institute and Condensed Matter Theory Center, University of Maryland, College Park, Department of Physics, University of Maryland, College Park, Maryland 20742, Condensed Matter Theory Center, University of Maryland, United States

  • Victor Galitski

    University of Maryland, Joint Quantum Institute and Condensed Matter Theory Center, University of Maryland, College Park, Department of Physics, University of Maryland, College Park, Maryland 20742, University of Maryland, College Park, Univ of Maryland-College Park, Joint Quantum Institute and Condensed Matter Theory Center, University of Maryland, United States