Ferroelectric Phase Transition in LiOsO<sub>3</sub>: Transformation from a Multi-type Dirac Semimetal into a Crossed-nodal-ring Semimetal

ORAL

Abstract

LiOsO3 is a ferroelectric metal. Upon lowering temperature, LiOsO3 undergoes a structural phase transition from the non-ferroelectric R-3c phase to the ferroelectric R3c phase with spontaneously broken inversion symmetry. Here we show that this transition also presents the first case of a topological phase transition between a multi-type Dirac semimetal and a crossed-nodal-ring semimetal. In the high-temperature non-ferroelectric phase, the nonsymmorphic glide mirrors help to stabilize multiple Dirac points close to the Fermi level, including three linear Dirac points at L, and one cubic and two linear Dirac points at T. Across the phase transition into the ferroelectric phase, the broken inversion symmetry transforms each linear Dirac point at L into a nodal ring, and interestingly, transforms the cubic Dirac point at T into three mutually-crossed nodal rings.

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Presenters

  • Xiaoting Zhou

    • Physics Division, National Center for Theoretical Science

Authors

  • Xiaoting Zhou

    • Physics Division, National Center for Theoretical Science

  • Wing Chi Yu

    • Centre for Advanced 2D Materials, National University of Singapore
    • The Chinese Univ of Hong Kong

  • Feng-chuan Chuang

    • Department of Physics, National Sun Yat-sen University

  • Shengyuan Yang

    • Singapore University of Technology and Design
    • Research Laboratory for Quantum Materials, Singapore University of Technology and Design
    • Singapore U. of Tec. and Design
    • Engineering Product Development Pillar, Singapore University of Technology and Design

  • Hsin Lin

    • Academia Sinica
    • National University of Singapore
    • Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
    • Institute of Physics, Academica Sinica
    • Institute of Physics, Academia Sinica
    • National U. of Singapore
    • Natl Univ of Singapore
    • National University of Signapore

  • Arun Bansil

    • Northeastern University
    • Department of Physics, Northeastern University
    • Northeastern Univ
    • Physics Department, Northeastern Univ
    • Physics Dept., Northeastern Univ
    • Physics, Northeastern University