Multiple topologically non-trivial bands in non-centrosymmetric YSn<sub>2</sub>

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