Multiple topologically non-trivial bands in non-centrosymmetric YSn2

ORAL

Abstract

We show that, in non-centrosymmetric compound YSn2, the slightly distorted square lattice of Sn generates multiple topologically non-trivial bands, one of which likely hosts nodal line and tunable Weyl semimetal state induced by the Rashba spin-orbit coupling (SOC) and proper external magnetic field. The quasiparticles described as relativistic fermions from these bands are manifested by nearly zero mass and non-trivial Berry phases probed in de Haas–van Alphen (dHvA) oscillations. The dHvA study also reveals YSn2 has a complicated Fermi surface (FS), consisting of several 3D and one 2D pockets. Our first principle calculations show the point-like 3D pocket at Y point on the Brillouin zone boundary hosts the possible Weyl state. Our findings establish YSn2 as a new interesting platform for observing novel topological phases and studying their underlying physics.

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Presenters

  • Yanglin Zhu

    Department of Physics and Engineering Physics, Tulane University, Tulane University, Physics and Engineering Physics, Tulane University

Authors

  • Yanglin Zhu

    Department of Physics and Engineering Physics, Tulane University, Tulane University, Physics and Engineering Physics, Tulane University

  • Tiantian Zhang

    Institute of physics, Chinese Academy of Sciences, Institute of Physics CAS, Institute of Physics

  • Jin Hu

    University of Arkansas, Department of Physics and Engineering Physics, Tulane University, Department of Physics, University of Arkansas

  • Jamin Kidd

    Tulane University

  • David E Graf

    National High Magnetic Field Laboratory, National High Magnetic Field Lab, Tallahassee, FL, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, NHMFL, Tallahassee, FL, United States, Florida State University, National High Magnetic Field Laboratory, Florida State University, NHMFL-FSU, National High Magnetic Field Laboratory and Florida State University, NHMFL

  • Xin Gui

    Chemistry, Louisiana State University, Louisiana State University, Department of Chemistry, Louisiana State University, Chemistry, Louisiana State Univeristy

  • Weiwei Xie

    Chemistry, Louisiana State University, Louisiana State University, Department of Chemistry, Louisiana State University, Chemistry, Louisiana State Univeristy

  • Mengze Zhu

    Department of Physics and Astronomy, Michigan State University

  • Xianglin Ke

    Department of Physics and Astronomy, Michigan State University, Michigan State Univ

  • Huibo Cao

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Zhong Fang

    Institute of Physics CAS, Institute of Physics

  • Hongming Weng

    Institute of Physics, Chinese Academy of Sciences, Institute of physics, Chinese Academy of Sciences, Chinese Academy of Sciences, Institute of Physics CAS, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Institute of Physics

  • Zhiqiang Mao

    Pennsylvania State University, Physics, Pennsylvania State University, Department of Physics and Engineering Physics, Tulane University, Physics and Engineering Physics, Tulane University, Tulane University