Experimental electronic structure of the switchable, topological, antiferromagnet CuMnAs

ORAL

Abstract

Electrical switching and read out of the AFM Néel vector orientation in tetragonal CuMnAs has
been experimentally demonstrated to be scalable to THz speeds, far exceeding speeds in state-
of-the-art memory devices today. Additionally, CuMnAs is predicted to host two Dirac points
protected by a nonsymorphic, glide mirror plane symmetry, which may or may not exist
depending on the orientation of the Néel vector, offering the possibility of opening and closing a gap at the Dirac point at THz speeds. Until now, we lacked experimental confirmation of the predicted electronic band structure, but here we report the electronic structure of tetragonal CuMnAs experimentally measured with ARPES, which we compare to DFT. We performed experiments on the (001) surface of tetragonal CuMnAs thin films, measuring Fermi surfaces, kz dispersion, and high symmetry cuts.

–

Presenters

  • Andrew Linn

    • University of Colorado, Boulder

Authors

  • Andrew Linn

    • University of Colorado, Boulder

  • Kyle Gordon

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

  • Peipei Hao

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

  • Bryan Berggren

    • University of Colorado, Boulder

  • Sonka Reimers

    • University of Nottingham

  • Nathaniel Speiser

    • University of Colorado, Boulder

  • Dushyant Narayan

    • University of Colorado, Boulder

  • Libor Smejkal

    • Johannes Gutenberg-Universität Mainz

  • Tomas Jungwirth

    • Institute of Solid State Physics, Czech Academy of Sciences
    • University of Nottingham

  • Peter Wadley

    • University of Nottingham

  • Daniel Stephen Dessau

    • University of Colorado, Boulder