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Title: Purely rotational symmetry-protected topological crystalline insulator α -Bi 4 Br 4

Journal Article · · 2D Materials

Abstract Rotational-symmetry-protected topological crystalline insulators (TCIs) are expected to host unique boundary modes, in that the surface normal to the rotational axis can feature surface states with ‘unpinned’ Dirac points, which are not constrained to lie on high symmetry points or lines, but can lie at any general k point in the Brillouin zone. Also, as a higher order bulk boundary correspondence is involved here, a three-dimensional (3D) TCI can support one-dimensional (1D) helical edge states. Using first-principles band structure calculations, we identify the van der Waals material -Bi 4 Br 4 as a purely rotation symmetry protected TCI. We show that the surface of Bi 4 Br 4 exhibits a pair of unpinned topological Dirac fermions which are related to the presence of a two-fold rotation axis. These unpinned Dirac fermions possess an exotic spin texture which will be highly favorable for spin transport, and a band structure that consists of van Hove singularities due to a Lifshitz transition. We also identify 1D topological hinge states along the edges of an -Bi 4 Br 4 rod. We comment on how the predicted topological features in -Bi 4 Br 4 could be accessed experimentally.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358; AC02-05CH11231
OSTI ID:
1515095
Alternate ID(s):
OSTI ID: 1526942
Journal Information:
2D Materials, Journal Name: 2D Materials Vol. 6 Journal Issue: 3; ISSN 2053-1583
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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