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Title: Evidence for a higher-order topological insulator in a three-dimensional material built from van der Waals stacking of bismuth-halide chains

Journal Article · · Nature Materials
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  1. Univ. of Tokyo, Kashiwa (Japan)
  2. Tokyo Inst. of Technology, Yokohama (Japan)
  3. Univ. of Texas, Austin, TX (United States)
  4. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  5. Osaka Univ., Toyonaka (Japan)
  6. National Inst. of Advanced Industrial Science and Technology, Tsukuba (Japan)
  7. Elettra Synchrotron Trieste, Basovizza (Italy)
  8. Diamond Light Source, Didcot (United Kingdom)
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  10. RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan); Univ. of Tokyo (Japan)
  11. 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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