Electronic structure of topological superconductor candidate Au2Pb

ORAL

Abstract

We use magnetization measurements, ARPES, and DFT calculations to study the electronic properties of topological superconductor Au2Pb. Magnetization data show discontinuities at 40, 51 and 99K, consistent with the reported structural transitions. ARPES data of Au2Pb (111) surface shows a hole pocket at the center and flower-petal-like surface states at the corners of the Brillouin zone, which match relatively well with the DFT calculations. Interestingly, these surface states seem to originate from a Dirac like dispersion close to the zone corner. Further ARPES data of Au2Pb (001) surface shows an electron pocket between G and X, consistent with the predicted location of the 3D Dirac states. However, a significant gap separates the conduction and valence bands, which is probably due to the off kz value probed by 21.2 eV photons. These results provide evidence for the possible existence of Dirac state in this material.

*Research was supported by the US DOE, Office of Basic Energy Sciences under Contract No. DEAC02-07CH11358; Gordon and Betty Moore Foundation EPiQS Initiative (Grant No. GBMF4411); CEM, a NSF MRSEC, under Grant No. DMR-1420451.

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Presenters

  • Yun Wu

    • Iowa state university/Ames Laboratory
    • Iowa State University / Ames Laboratory

Authors

  • Yun Wu

    • Iowa state university/Ames Laboratory
    • Iowa State University / Ames Laboratory

  • Gil Drachuck

    • Physics, Technion
    • Iowa State University / Ames Laboratory

  • Lin-Lin Wang

    • Ames Laboratory
    • Iowa State University / Ames Laboratory

  • Duane Johnson

    • Iowa State University
    • Iowa state university/Ames Laboratory
    • Iowa State University / Ames Laboratory

  • Daixiang Mou

    • Iowa state university/Ames Laboratory
    • Iowa State University / Ames Laboratory

  • Przemyslaw Swatek

    • Iowa State University / Ames Laboratory

  • Lunan Huang

    • Iowa State University / Ames Laboratory

  • Benjamin Schrunk

    • Iowa State University / Ames Laboratory

  • Sergey Bud'ko

    • The Ames Laboratory
    • Iowa state university/Ames Laboratory
    • Iowa State University and Ames Laboratory
    • Iowa State University/Ames Laboratory
    • Iowa State University / Ames Laboratory
    • Ames Laboratory and Iowa State University, Dept. of Physics and Astronomy
    • Dept. of Physics, Iowa State Univ
    • Ames Lab
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Paul Canfield

    • Ames Laboratory and Iowa State University
    • Ames Laboratory, Iowa State University
    • Department of Physics and Astronomy, Iowa State University
    • Dept. of Physics and Astronomy, Ames Laboratory/Iowa State University
    • Iowa state university/Ames Laboratory
    • Ames Laboratory and Iowa State Univ
    • Iowa State University and Ames Laboratory
    • Iowa State University/Ames Laboratory
    • Iowa State University
    • Iowa State University / Ames Laboratory
    • Dept. of Physics, Iowa State Univ
    • Ames Lab
    • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University
    • Iowa State Univ
    • Ames Laboratory
    • Department of Physics and Astronomy, Ames Laboratory and Iowa State University

  • Adam Kaminski

    • Iowa state university/Ames Laboratory
    • Iowa State University / Ames Laboratory