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Fermi Surface Topology and Evidence of Non-trivial Berry Phase in the Flat-band Semimetal Pd<sub>3</sub>Pb

ORAL

Abstract

We present a study of the Fermi surface of the putative triple point topological semimetal Pd3Pb carried out by measuring Shubnikov-de Haas (SdH) oscillations in fields of up to 60 T. A multi-sheet Fermi surface has been reconstructed from the oscillation data and is largely in agreement with DFT calculations, albeit with a Fermi level shifted slightly (~30 meV) by small electron doping. A Berry-phase analysis of the SdH oscillations reveals a non-trivial phase for two bands along high symmetry directions, confirming the topological nature of Pd3Pb. Importantly, the phase of the oscillation shows an angular dependence with respect to the direction of the applied magnetic field. With the signature of a topological phase transition to a trivial phase, this angular dependence may signify a unique identity of the evolution of triple point fermionic states under field.

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Presenters

  • Mojammel Alam Khan

    Argonne Natl Lab

Authors

  • Mojammel Alam Khan

    Argonne Natl Lab

  • Nirmal Ghimire

    Department of Physics and Astronomy, George Mason University, George Mason University, Argonne Natl Lab

  • Terence Bretz-Sullivan

    Materials Science Division, Argonne National Laboratory, Argonne Natl Lab

  • Anand Bhattacharya

    Materials Science Division, Argonne National Laboratory, Argonne National Laboratory, Argonne Natl Lab

  • J Samuel Jiang

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Argonne Natl Lab

  • Po-Hao Chang

    University of Texas, El Paso, Physics, University of Texas at El Paso, George Mason University

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • John Mitchell

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Argonne Natl Lab, Materials Science Division, Argonne National Lab, Material Science Division, Argonne National Lab