A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi4I4
- Swiss Federal Inst. of Technology in Lausanne (EPFL) (Switzlerland). Inst. of Theoretical Physics. National Center for Computational Design and Discovery of Novel Materials MARVEL
- TU Dresden (Germany). Dept. of Chemistry and Food Chemistry
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Swiss Federal Inst. of Technology in Lausanne (EPFL) (Switzlerland). Inst. of Condensed Matter Physics
- 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
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Lomonosov Moscow State Univ., Moscow (Russian Federation). Dept. of Chemistry
- Ulm Univ. (Germany). Experimental Physics
- 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
- 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 M¯ 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
Web of Science
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