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A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi4I4

  • Author(s): Autès, G
  • Isaeva, A
  • Moreschini, L
  • Johannsen, JC
  • Pisoni, A
  • Mori, R
  • Zhang, W
  • Filatova, TG
  • Kuznetsov, AN
  • Forró, L
  • Van Den Broek, W
  • Kim, Y
  • Kim, KS
  • Lanzara, A
  • Denlinger, JD
  • Rotenberg, E
  • Bostwick, A
  • Grioni, M
  • Yazyev, OV
  • et al.

Published Web Location

https://doi.org/10.1038/nmat4488
Abstract

© 2016 Macmillan Publishers Limited. All rights reserved. Recent progress in the field of topological states of matter has largely been initiated by the discovery of bismuth and antimony chalcogenide bulk topological insulators (TIs; refs 3-6), followed by closely related ternary compounds and predictions of several weak TIs (refs 17-19). However, both the conceptual richness of Z2classification of TIs as well as their structural and compositional diversity are far from being fully exploited. Here, a new Z2topological insulator is theoretically predicted and experimentally confirmed in the β-phase of quasi-one-dimensional bismuth iodide Bi4I4. The electronic structure of β-Bi4I4, characterized by Z2invariants (1;110), is in proximity of both the weak TI phase (0;001) and the trivial insulator phase (0;000). Our angle-resolved photoemission spectroscopy measurements performed on the (001) surface reveal a highly anisotropic band-crossing feature located at the M¯ point of the surface Brillouin zone and showing no dispersion with the photon energy, thus being fully consistent with the theoretical prediction.

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