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Philip Hofmann

One-dimensional spin texture of Bi(441): Quantum spin Hall properties without a topological insulator

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

DOI

  • M. Bianchi
  • F. Song, Univ Groningen, University of Groningen, Zernike Inst Adv Mat, Chinese Acad Sci, Chinese Academy of Sciences, Shanghai Inst Appl Phys
  • ,
  • S. Cooil, Norwegian Univ Sci & Technol NTNU, Norwegian University of Science & Technology, Dept Phys
  • ,
  • A. F. Monsen, Norwegian Univ Sci & Technol NTNU, Norwegian University of Science & Technology, Dept Phys
  • ,
  • E. Wahlstrom, Norwegian Univ Sci & Technol NTNU, Norwegian University of Science & Technology, Dept Phys
  • ,
  • J. A. Miwa
  • E. D. L. Rienks, Helmholtz Zentrum Berlin, Helmholtz Association, Helmholtz-Zentrum Berlin (HZB)
  • ,
  • D. A. Evans
  • ,
  • A. Strozecka, Free Univ Berlin, Free University of Berlin, Inst Expt Phys
  • ,
  • J. I. Pascual, CIC nanoGUNE
  • ,
  • M. Leandersson, Lund University
  • ,
  • T. Balasubramanian, Lund University
  • ,
  • Philip Hofmann
  • J. W. Wells, Norwegian Univ Sci & Technol NTNU, Norwegian University of Science & Technology, Dept Phys

The high index (441) surface of bismuth has been studied using scanning tunneling microscopy (STM), angle resolved photoemission spectroscopy (APRES), and spin-resolved ARPES. The surface is strongly corrugated, exposing a regular array of (110)-like terraces. Two surface localized states are observed, both of which are linearly dispersing in one in-plane direction (k(x)), and dispersionless in the orthogonal in-plane direction (k(y)), and both of which have a Dirac-like crossing at k(x) = 0. Spin ARPES reveals a strong in-plane polarization, consistent with Rashba-like spin-orbit coupling. One state has a strong out-of-plane spin component, which matches with the miscut angle, suggesting its possible origin as an edge state. The electronic structure of Bi(441) has significant similarities with topological insulator surface states and is expected to support one-dimensional quantum spin Hall-like coupled spin-charge transport properties with inhibited backscattering, without requiring a topological insulator bulk.

OriginalsprogEngelsk
Artikelnummer165307
TidsskriftPhysical Review B
Vol/bind91
Nummer16
Antal sider5
ISSN2469-9950
DOI
StatusUdgivet - 21 apr. 2015

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