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  • Author(s):
    Joseph A Hagmann, Xiang Li, Sugata Chowdhury, Si-Ning Dong, Sergei Rouvimov, Sujitra J Pookpanratana, Kin Man Yu, Tatyana A Orlova, Trudy B Bolin, Carlo U Segre
    Abstract:

    We demonstrate that the introduction of an elemental beam of Mn during the molecular beam epitaxial growth of Bi2Se3 results in the formation of layers of Bi2MnSe4 that intersperse between layers of pure Bi2Se3. This study revises the assumption held by many who study magnetic topological insulators (TIs) that Mn incorporates randomly at Bi-substitutional sites during epitaxial growth of Mn:Bi2Se3. Here, we report the formation of thin film magnetic TI Bi2MnSe4 with stoichiometric composition…

    Date Published:
    2017
  • Author(s):
    Vasily Kanzyuba, Sining Dong, Xinyu Liu, Xiang Li, Sergei Rouvimov, Hanako Okuno, Henri Mariette, Xueqiang Zhang, Sylwia Ptasinska, Brian D. Tracy, David J. Smith, Margaret Dobrowolska, Jacek K. Furdyna
    Abstract:

    We describe the structural evolution of dilute magnetic (Sn,Mn)Se films grown by molecular beam epitaxy on GaAs (111) substrates, as revealed by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. When the Mn concentration is increased, the lattice of the ternary (Sn,Mn)Se films evolves quasi-coherently from a SnSe2 two-dimensional (2D) crystal structure into a more complex quasi-2D lattice rearrangement, ultimately transforming into the magnetically con…

    Date Published:
    2017
  • Author:
    Xiang Li
    Advisory Committee:
    Jacek Furdyna, Malgorzata Dobrowolska
    Degree Area:
    Physics
    Degree:
    PhD
    Defense Date:
    2017-10-09
  • Author:
    Xiang Li
    Advisory Committee:
    Patrick Fay
    Degree Area:
    Electrical Engineering
    Degree:
    PhD
    Defense Date:
    2005-07-11