Evidence for a higher-order topological insulator in a three-dimensional material built from van der Waals stacking of bismuth-halide chains
- Univ. of Tokyo, Kashiwa (Japan)
- Tokyo Inst. of Technology, Yokohama (Japan)
- Univ. of Texas, Austin, TX (United States)
- RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
- Osaka Univ., Toyonaka (Japan)
- National Inst. of Advanced Industrial Science and Technology, Tsukuba (Japan)
- Elettra Synchrotron Trieste, Basovizza (Italy)
- Diamond Light Source, Didcot (United Kingdom)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)
- Univ. of Tokyo, Kashiwa (Japan); Univ. of Tokyo (Japan)
Low-dimensional van der Waals materials have been extensively studied as a platform with which to generate quantum effects. Advancing this research, topological quantum materials with van der Waals structures are currently receiving a great deal of attention. Here, we use the concept of designing topological materials by the van der Waals stacking of quantum spin Hall insulators. Most interestingly, we find that a slight shift of inversion centre in the unit cell caused by a modification of stacking induces a transition from a trivial insulator to a higher-order topological insulator. Based on this, we present angle-resolved photoemission spectroscopy results showing that the real three-dimensional material Bi4Br4 is a higher-order topological insulator. Our demonstration that various topological states can be selected by stacking chains differently, combined with the advantages of van der Waals materials, offers a playground for engineering topologically non-trivial edge states towards future spintronics applications.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); United States Army Research Office; JSPS KAKENHI; MEXT Q-LEAP; KAKENHI
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1767933
- Journal Information:
- Nature Materials, Journal Name: Nature Materials Journal Issue: 4 Vol. 20; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | September 2019 |
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