Quantum transport in Dirac semimetal Cd<sub>3</sub>As<sub>2</sub> thin films

ORAL

Abstract

The synthesis of thin films of the Dirac semimetal (DSM) Cd3As2 by molecular beam epitaxy (MBE) provides an attractive avenue for studying quantum transport in a DSM as a function of quantum confinement and chemical potential. We have used MBE to grow thin films of Cd3As2 on GaAs (111)B substrates with a GaSb buffer layer. The film thickness is varied in the range of 7 nm – 20 nm. Atomic force microscopy, x-ray diffraction, and electrical transport show that the films have good crystalline quality (root mean square surface roughness ~ 1.5 nm and full-width half maximum of rocking curves ~ 0.12°) and reasonable electron mobility (5,000 – 40,000 cm2/V.s at 4.2 K). We have studied Shubnikov-de Haas oscillations in lithographically patterned top gated Hall bar devices as a function of gate voltage, temperature, and magnetic field magnitude/angle. We interpret these quantum oscillation data in concert with in vacuo angle-resolved photoemission spectroscopy and first-principles calculations to gain insight into the Fermi surface of these DSM thin films.

*Supported by the Institute for Quantum Matter under DOE EFRC grant DE-SC0019331, the nCORE/SMART Center, and the Penn State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under NSF Grant No. DMR-1539916

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Presenters

  • Run Xiao

    • Pennsylvania State University
    • Physics, Pennsylvania State University

Authors

  • Run Xiao

    • Pennsylvania State University
    • Physics, Pennsylvania State University

  • Sayak Ghosh

    • Cornell University

  • Arpita Mitra

    • Pennsylvania State University

  • Wilson Yanez

    • Pennsylvania State University
    • Physics, Pennsylvania State University

  • Timothy S Pillsbury

    • Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • The Pennsylvania State University

  • Yawen Fang

    • Cornell University

  • Juan Chamorro

    • Johns Hopkins University

  • Santu Baidya

    • Rutgers University
    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University

  • Tanya Berry

    • Johns Hopkins University
    • The Johns Hopkins University

  • David Vanderbilt

    • Rutgers University, New Brunswick
    • Rutgers University
    • Physics, Rutger Univeristy
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA

  • Yi Li

    • Johns Hopkins University

  • Tyrel McQueen

    • Johns Hopkins University
    • The Johns Hopkins University
    • Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University

  • Brad Ramshaw

    • Cornell University
    • Physics, Cornell University

  • Nitin Samarth

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • The Pennsylvania State University