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