Experimental electronic structure of the electronically switchable antiferromagnet, CuMnAs

ORAL

Abstract

Tetragonal CuMnAs is a room temperature antiferromagnet with an electrically reorientable Néel vector. We report direct measurements of the electronic structure of single-crystalline thin films using ARPES. We extract Fermi surfaces (FS) and E-k dispersions. After correcting for an unexpected chemical potential shift of -430 meV (hole doping), we find excellent agreement of FS, orbital character, and Fermi velocities between experiment and Density Functional Theory calculations (DFT), using GGA+U with U = 3 eV. We also find 2x1 surface reconstructions in LEED and ARPES. This work underscores the need to control the chemical potential in tetragonal CuMnAs to enable the exploration and exploitation of the topological quantum switching of the Dirac point above the chemical potential in the current samples.

*This research used resources of the Advanced Light Source, a U.S. DOE Office of Science User Facility under contract no. DE-AC02-05CH11231.

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Presenters

  • Andrew Linn

    • University of Colorado, Boulder

Authors

  • Andrew Linn

    • University of Colorado, Boulder

  • Kyle Gordon

    • University of Colorado, Boulder

  • PEIPEI HAO

    • University of Colorado, Boulder

  • Dushyant Narayan

    • University of Colorado, Boulder

  • Bryan Berggren

    • University of Colorado, Boulder

  • Nathaniel Allen Speiser

    • University of Colorado, Boulder

  • Sonka Reimers

    • University of Nottingham

  • Libor Smejkal

    • Institute of Physics, Johannes Gutenberg-Universitat Mainz, Germany
    • Johannes Gutenberg-Universität Mainz
    • Uni Mainz

  • Thomas Jungwirth

    • Institute of Physics of the Czech Academy of Sciences
    • Academy of Sciences of the Czech Republic

  • Jonathan Denlinger

    • Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Advanced Light Source
    • Advanced Light Source, LBNL
    • Advanced light source
    • Advanced Light Source, Lawrence Berkeley National Lab

  • Peter Wadley

    • University of Nottingham

  • Daniel Dessau

    • University of Colorado, Boulder
    • Physics, University of Colorado Boulder