Anomalous quantum oscillations in a spin-3/2 topological semimetal: II. Theory

ORAL

Abstract

Gapless spin-3/2 quasiparticles lead to an unprecedented class of high-spin topological superconductivity which hosts a Majorana fluid on the surface. The spin-3/2 Fermi surface can be realized in a crystal lattice with high symmetry. The RPtBi (R=rare earth) half-Heuslers are a family of promising candidates, in which strong spin-orbit interaction inverts the Bi p-orbital derived bands and Bi s-orbital derived bands. In this particular case, the low energy quasiparticles are adequately described by the four-band Luttinger–Kohn model. In this talk, we report compelling evidence for a spin-3/2 Fermi surface in YPtBi via studies of the angle-dependent Shubnikov-de Haas (SdH) effect uniquely explained by the anisotropic effect of Zeeman interaction on spin-3/2 quasiparticles, confirming the long-awaited high-spin nature of topological semimetal RPtBi compounds.

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Presenters

  • Junhyun Lee

    • Condensed Matter Theory Center, Joint Quantum Institute and Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park
    • Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park

Authors

  • Junhyun Lee

    • Condensed Matter Theory Center, Joint Quantum Institute and Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park
    • Condensed Matter Theory Center and Joint Quantum Institute, University of Maryland, College Park

  • Hyunsoo Kim

    • University of Maryland, College Park
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742

  • Halyna Hodovanets

    • University of Maryland, College Park
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742

  • Kefeng Wang

    • University of Maryland, College Park
    • Brookhaven National Laboratory
    • Department of Physics, University of Maryland, College Park

  • Jay Sau

    • University of Maryland, College Park
    • Physics, University of Maryland, College Park
    • Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, Univeristy of Maryland

  • Johnpierre Paglione

    • University of Maryland, College Park
    • Physics Department, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park
    • Department of Physics, University of Maryland, College Park
    • University of Maryland, College Park & NIST
    • Univ of Maryland-Colege Park
    • Center for Quantum Materials, University of Maryland
    • Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742