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Field-Tuning Magnetic Domains and Pinned Chiral Edge States in the Axion Insulator Candidate EuIn<sub>2</sub>As<sub>2</sub>

ORAL

Abstract

We examine how an in-plane magnetic field tunes the magnetic domains and associated chiral edge states (CES) of the axion insulator candidate EuIn2As2, which exhibits a remarkable broken-helix order for zero field. Using neutron diffraction and analytic theory, we determine how the magnetic symmetry of each domain transforms with increasing field and predict that domain walls have pinned hinge-CES with half-integer quantum-anomalous-Hall type conductivity. The pinned CES are predicted to persist and move with the domain walls, demonstrating a degree of tunability. We also highlight how changes in surface mass terms at critical field strengths can lead to the disappearance of hinge-CES on certain surfaces and the emergence of new hinge-CES on others.

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Presenters

  • Benjamin G. Ueland

    Ames National Laboratory, Ames National Laboratory and Iowa State University

Authors

  • Simon Xavier Marie Riberolles

    Ames National Laboratory, Ames National Laboratory and Iowa State University

  • Ana-Marija Nedić

    University of Minnesota

  • Brinda Kuthanazhi

    University of Liverpool, Ames National Laboratory and Iowa State University

  • Feng Ye

    Oak Ridge National Laboratory

  • Sergey L Bud'ko

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory and Iowa State University

  • Paul C Canfield

    Iowa State University, Ames National Laboratory, and Department of Physics and Astronomy, Iowa State University, Ames National Laboratory and Iowa State University

  • Robert J McQueeney

    Iowa State University, Ames National Laboratory and Iowa State University

  • Junyeong Ahn

    The University of Texas at Austin

  • Victor L Quito

    University of Sao Paulo (USP)

  • Thais V Trevisan

    University of São Paulo, São Carlos Institute of Physics, University of São Paulo, Ames Laboratory, University of Sao Paulo, UC Berkeley

  • Lin-Lin Wang

    Ames National Laboratory and Iowa State University, Ames National Laboratory

  • Peter P Orth

    Universität des Saarlandes, Saarland University

  • Benjamin G. Ueland

    Ames National Laboratory, Ames National Laboratory and Iowa State University