Degeneracy and topology for the magnetic space group of CuBi$_2$O$_4$

ORAL

Abstract

In the presence of antiferromagnetic order CuBi$_2$O$_4$ belongs to one of $\#56$ magnetic space groups. Inversion-time-reversal symmetry leads to 2-fold degeneracy of all the energy bands in the entire Brillouin zones. It surprises us that non-symmorphic symmetries in the subgroup $\#56$ space group protect 4-fold degeneracy in a symmetric line. We further investigate the topology and surface states of CuBi$_2$O$_4$ stemming from its magnetic space group.

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Authors

  • Andreas Schnyder

    • Max-Planck-Institute for Solid State Research, Stuttgart
    • Max Planck Institute for Solid State Research

  • Yang-Hao Chan

    • Institute of Atomic and Molecular Sciences, Academia Sinica

  • Ching-Kai Chiu

    • The University of Maryland, College Park
    • University of Maryland, College Park
    • Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA
    • University of Maryland
    • Univ of Maryland-College Park