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

Journal Article · · Nature Materials
DOI:https://doi.org/10.1038/nmat4488· OSTI ID:1460290
ORCiD logo [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [7];  [4];  [8];  [9];  [10];  [6];  [3];  [3];  [3];  [4]; ORCiD logo [1]
  1. Swiss Federal Inst. of Technology in Lausanne (EPFL) (Switzlerland). Inst. of Theoretical Physics. National Center for Computational Design and Discovery of Novel Materials MARVEL
  2. TU Dresden (Germany). Dept. of Chemistry and Food Chemistry
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Swiss Federal Inst. of Technology in Lausanne (EPFL) (Switzlerland). Inst. of Condensed Matter Physics
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Graduate Group in Applied Science and Technology
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  7. Lomonosov Moscow State Univ., Moscow (Russian Federation). Dept. of Chemistry
  8. Ulm Univ. (Germany). Experimental Physics
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Yonsei Univ., Seoul (Korea, Republic of). Inst. of Physics and Applied Physics
  10. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics; Inst. for Basic Science, Pohang (Korea, Republic of). Center for Artificial Low Dimensional Electronic Systems

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, followed by closely related ternary compounds and predictions of several weak TIs. However, both the conceptual richness of Z2 classification of TIs as well as their structural and compositional diversity are far from being fully exploited. In this paper, a new Z2 topological 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 Z2 invariants (1;110), is in proximity of both the weak TI phase (0;001) and the trivial insulator phase (0;000). Finally, our angle-resolved photoemission spectroscopy measurements performed on the (001) surface reveal a highly anisotropic band-crossing feature located at the point of the surface Brillouin zone and showing no dispersion with the photon energy, thus being fully consistent with the theoretical prediction.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF); European Research Council (ERC); German Research Foundation (DFG); Carl Zeiss Foundation (Germany)
Grant/Contract Number:
AC02-05CH11231; PP00P2_133552; PA00P21-36420; 306504; IS 250/1-1
OSTI ID:
1460290
Journal Information:
Nature Materials, Vol. 15, Issue 2; ISSN 1476-1122
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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Cited By (15)

Oscillating edge states in one-dimensional MoS2 nanowires journal October 2016
Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi4I4 journal January 2018
A weak topological insulator state in quasi-one-dimensional bismuth iodide journal February 2019
Tuning the upconversion light emission by bandgap engineering in bismuth oxide-based upconverting nanoparticles journal January 2017
Pressure-induced phase transitions and superconductivity in a quasi–1-dimensional topological crystalline insulator α-Bi 4 Br 4 journal August 2019
Purely rotational symmetry-protected topological crystalline insulator $\alpha$ -Bi 4 Br 4 journal May 2019
First-principles study of high-pressure phase stability and superconductivity of Bi 4 I 4 journal December 2019
Self-organized pseudo-graphene on grain boundaries in topological band insulators journal June 2016
Aperiodic Weak Topological Superconductors journal June 2016
Proving Nontrivial Topology of Pure Bismuth by Quantum Confinement journal December 2016
Evidence for a Strong Topological Insulator Phase in ZrTe 5 journal November 2016
Phase diagrams in materials science of topological insulators based on metal chalcogenides journal December 2017
High-Pressure Modification of BiI3 journal December 2019
Self-organized pseudo-graphene on grain boundaries in topological band insulators text January 2015
Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi4I4 preprint January 2017