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.

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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