Dirac dispersion and non-trivial Berry's phase in new 3D semimetals

COFFEE_KLATCH  · Invited

Abstract

Following the discovery of topological insulators, new classes of topological materials such as Dirac semimetals, Weyl semimetals, nodal line and nodal chain semimetals, have received considerable interest. In Dirac systems, linearly dispersing valence and conduction bands touch at discrete points of four-fold degeneracy in the Brillouin zone, giving Dirac nodes protected against gap formation by crystal symmetry. Although there have extensive studies, the topological semimetals are still rare, making it imperative to explore more candidates and their physical properties. Here we will report the electronic structure analysis, transport properties and ARPES/quantum oscillation study of several new three-dimensional semimetals including RhSb3, VAl3, etc. These semimetals exhibit Dirac dispersion and non-trivial Berry’s phase, as well as extremely large magnetoresistance, which suggests them as 3D Dirac semimetal candidates.

*This work was supported by the Gordon and Betty Moore Foundations EPiQS Initiative through Grant GBMF4419.A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida.

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Presenters

  • Kefeng Wang

    • University of Maryland, College Park
    • CNAM, Physics Department, University of Maryland
    • Univ of Maryland-College Park

Authors

  • Kefeng Wang

    • University of Maryland, College Park
    • CNAM, Physics Department, University of Maryland
    • Univ of Maryland-College Park

  • Brad Ramshaw

    • Cornell University
    • Los Alamos National Labs
    • National High Magnetic Field Laboratory
    • Department of Physics, Cornell University
    • Laboratory of Atomic and Solid State Physics, Cornell University
    • Los Alamos National Laboratory
    • Laboratory for Atomic and Solid state Physics, Cornell University

  • David Graf

    • NHMFL Tallahassee
    • NHMFL
    • National High Magnetic Field Lab
    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory/Florida State University
    • Natl High Magnetic Field Lab
    • NHMFL at Florida State University
    • Florida State University, National High Magnetic Field Laboratory
    • Florida State University
    • Condensed Matter Science, NHMFL

  • Limin Wang

    • CNAM, Department of Physics, Univ of Maryland-College Park
    • Univ of Maryland-College Park
    • Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland
    • CNAM, Physics Department, University of Maryland