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.

*This work is supported by the U.S. Department of Energy (U.S. DOE), Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, and the Center for Advancement of Topological Semimetals (CATS), an Energy Frontier Research Center funded by U.S. DOE, BES, through the Ames National Laboratory under Contract No. DE-AC02-07CH11358. This research used resources at the Spallation Neutron Source, which is a U.S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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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