Bi$_{2}$-Bi$_{2}$Se$_{3}$ Superlattice Materials Studied by Photoemission Spectroscopy

ORAL

Abstract

Although searches are carried out independently for new 2D quantum spin Hall or 3D topological materials for their robust, spin-polarized edge or surface conduction states, little has been done to experimentally show that both phases can coexist in a single material or explore how they may interact. The superlattice series Bi$_{\mathrm{2m}}$(Bi$_{2}$Se$_{3})_{\mathrm{n}}$, featuring stacked layers of Bi$_{2}$ and Bi$_{2}$Se$_{3}$, may contain systems where a combination of 2D and 3D topological phenomena should be at play, the latter of which can be identified by combined computational and spin-and angle-resolved photoemission spectroscopy studies. We find that several members of the series, (m$=$0, n$=$1), (m$=$1, n$=$1) and (m$=$2, n$=$1) have spin-chiral surface states at the center of the surface Brillouin zone, a trait of strong topological insulators. The characterization of the topological surface states will be discussed for these series members.

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Authors

  • Andrew Weber

    • Department of Physics and Astronomy, University of Missouri-Kansas City
    • Brookhaven Natl Lab

  • Ivo Pletikosic

    • Department of Chemistry, Princeton University
    • Princeton University
    • Princeton University \& Brookhaven Natl Lab

  • Quinn Gibson

    • Princeton Univ
    • Department of Chemistry, Princeton University

  • Huiwen Ji

    • Princeton University Chemistry Department
    • Department of Chemistry, Princeton University

  • Leslie Schoop

    • Department of Chemistry, Princeton University
    • Princeton University

  • Jurek Sadowski

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Anthony Caruso

    • Department of Physics and Astronomy, University of Missouri-Kansas City
    • Univ of Missouri - Kansas City
    • Department of Physics, University of Missouri - Kansas City
    • Dept. of Physics and Astronomy, Univ. Missouri, Kansas City

  • Elio Vescovo

    • National Synchrotron Light Source, Brookhaven National Laboratory
    • Brookhaven Natl Lab

  • Alexei Fedorov

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Robert Cava

    • Department of Chemistry, Princeton University
    • Department of Chemistry, Princeton university, Princeton NJ 08544 USA
    • Princeton University Chemistry Department
    • Institute for Quantum Matter, Princeton University
    • Department of Chemistry, Princeton University, NJ, 08544, USA
    • Princeton University

  • Tonica Valla

    • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Brookhaven Natl Lab