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    Electronic Properties of High-Quality Epitaxial Topological Dirac Semimetal Thin Films

    Access Status
    Fulltext not available
    Authors
    Hellerstedt, J.
    Edmonds, M.
    Ramakrishnan, N.
    Liu, C.
    Weber, B.
    Tadich, A.
    O'Donnell, Kane
    Adam, S.
    Fuhrer, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Hellerstedt, J. and Edmonds, M. and Ramakrishnan, N. and Liu, C. and Weber, B. and Tadich, A. and O'Donnell, K. et al. 2016. Electronic Properties of High-Quality Epitaxial Topological Dirac Semimetal Thin Films. Nano Letters: a journal dedicated to nanoscience and nanotechnology. 16 (5): pp. 3210-3214.
    Source Title
    Nano Letters: a journal dedicated to nanoscience and nanotechnology
    DOI
    10.1021/acs.nanolett.6b00638
    ISSN
    1530-6984
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/51112
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 American Chemical Society.Topological Dirac semimetals (TDS) are three-dimensional analogues of graphene, with linear electronic dispersions in three dimensions. Nanoscale confinement of TDSs in thin films is a necessary step toward observing the conventional-to-topological quantum phase transition (QPT) with increasing film thickness, gated devices for electric-field control of topological states, and devices with surface-state-dominated transport phenomena. Thin films can also be interfaced with superconductors (realizing a host for Majorana Fermions) or ferromagnets (realizing Weyl Fermions or T-broken topological states). Here we report structural and electrical characterization of large-area epitaxial thin films of TDS Na3Bi on single crystal Al2O3[0001] substrates. Charge carrier mobilities exceeding 6,000 cm2/(V s) and carrier densities below 1 × 1018 cm-3 are comparable to the best single crystal values. Perpendicular magnetoresistance at low field shows the perfect weak antilocalization behavior expected for Dirac Fermions in the absence of intervalley scattering. At higher fields up to 0.5 T anomalously large quadratic magnetoresistance is observed, indicating that some aspects of the low field magnetotransport (µB < 1) in this TDS are yet to be explained.

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