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Glide Symmetry Protected Higher-Order Topological Insulators from Semimetals with butterfly-like Nodal Lines

ORAL

Abstract

We propose a new family of topological semimetals (TSMs) which harbors an unprecedented nodal line (NL) landscape consisting of a pair of concentric intersecting coplanar ellipses (CICE). We identify the generic criteria for the existence of the CICE in a time reversal invariant spinless fermion system with negligible spin-orbital coupling (SOC). Consequently, 9 out of 230 space groups (SGs) are feasible for hosting CICE whose location centers in the Brillouin zone (BZ) are identified. We provide a simplest model with SG Pbam which exhibits CICE, and the exotic intertwined drumhead surface states. Then, we unveil the intrinsic link between this exotic class of nodal-line semimetals (NLSMs) and a Z4 = 2 topological crystalline insulator (TCI), by including substantial SOC. This TCI supports in turn a double-hourglass fermion on the (001) surface protected by two glide mirror symmetries, which originates from the intertwined drumhead surface states (DSSs) of the CICE NLs. The higher order topology is further demonstrated for the first time by the emergence of one-dimensional (1D) helical hinge states protected by a glide symmetry.

Zhou, X. et al. arXiv:2005.04360 (2020).
Zhou, X. et al. arXiv:2005.06071 (2020).

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Presenters

  • XIAOTING ZHOU

    Physics, Northeastern University, Department of Physics, Northeastern University, USA

Authors

  • XIAOTING ZHOU

    Physics, Northeastern University, Department of Physics, Northeastern University, USA

  • Chuang-Han Hsu

    Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore, Institute of Physics, Academia Sinica, Taipei, Institute of Physics, Academia Sinica

  • Hugo Aramberri

    Physics and Astronomy, California State University, Northridge, Physics, California State University, Northridge

  • Cheng-Yi Huang

    Department of Physics, Northeastern University, Physics, Northeastern University, Physics, California State University, Northridge

  • Mikel Iraola

    Department of Condensed Matter Physics, University of the Basque Country UPV/EHU, Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain

  • Juan L. Mane

    Department of Condensed Matter Physics, University of the Basque Country UPV/EHU, Apartado 644, 48080 Bilbao, Spain

  • Maia Garcia Vergniory

    Donostia International Physics Center, Donostia International Physics Center-DIPC, Donostia International Physics Center, Spain, Donastia nternational Physics Center, San Sebastian, Spain

  • Hsin Lin

    Institute of Physics, Academia Sinica, Academia Sinica, Institute of Physics, Academia Sinica, Taipei, Institute of Physics, Academia Sinica, Taiwan, Physics, Academia Sinica

  • Nicholas Kioussis

    Department of Physics and Astronomy, California State University, Northridge, Northridge, California State University, Physics and Astronomy, California State University, Northridge, Physics, California State University, Northridge, California State University, Northridge