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Title: Purely rotational symmetry-protected topological crystalline insulator $$\alpha$$ -Bi 4 Br 4

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 $$\alpha$$ -Bi 4 Br 4 as a purely rotation symmetry protected TCI. We show that the (0 1 0) 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 $$\alpha$$ -Bi 4 Br 4 rod. We comment on how the predicted topological features in $$\alpha$$ -Bi 4 Br 4 could be accessed experimentally.

Authors:
ORCiD logo; ; ; ; ; ; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1515095
Alternate Identifier(s):
OSTI ID: 1526942
Grant/Contract Number:  
[AC02-07CH11358; AC02-05CH11231]
Resource Type:
Published Article
Journal Name:
2D Materials
Additional Journal Information:
[Journal Name: 2D Materials Journal Volume: 6 Journal Issue: 3]; Journal ID: ISSN 2053-1583
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Hsu, Chuang-Han, Zhou, Xiaoting, Ma, Qiong, Gedik, Nuh, Bansil, Arun, Pereira, Vitor M., Lin, Hsin, Fu, Liang, Xu, Su-Yang, and Chang, Tay-Rong. Purely rotational symmetry-protected topological crystalline insulator $\alpha$ -Bi 4 Br 4. United Kingdom: N. p., 2019. Web. doi:10.1088/2053-1583/ab1607.
Hsu, Chuang-Han, Zhou, Xiaoting, Ma, Qiong, Gedik, Nuh, Bansil, Arun, Pereira, Vitor M., Lin, Hsin, Fu, Liang, Xu, Su-Yang, & Chang, Tay-Rong. Purely rotational symmetry-protected topological crystalline insulator $\alpha$ -Bi 4 Br 4. United Kingdom. doi:10.1088/2053-1583/ab1607.
Hsu, Chuang-Han, Zhou, Xiaoting, Ma, Qiong, Gedik, Nuh, Bansil, Arun, Pereira, Vitor M., Lin, Hsin, Fu, Liang, Xu, Su-Yang, and Chang, Tay-Rong. Wed . "Purely rotational symmetry-protected topological crystalline insulator $\alpha$ -Bi 4 Br 4". United Kingdom. doi:10.1088/2053-1583/ab1607.
@article{osti_1515095,
title = {Purely rotational symmetry-protected topological crystalline insulator $\alpha$ -Bi 4 Br 4},
author = {Hsu, Chuang-Han and Zhou, Xiaoting and Ma, Qiong and Gedik, Nuh and Bansil, Arun and Pereira, Vitor M. and Lin, Hsin and Fu, Liang and Xu, Su-Yang and Chang, Tay-Rong},
abstractNote = {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 $\alpha$ -Bi4 Br4 as a purely rotation symmetry protected TCI. We show that the (0 1 0) surface of Bi4 Br4 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 $\alpha$ -Bi4 Br4 rod. We comment on how the predicted topological features in $\alpha$ -Bi4 Br4 could be accessed experimentally.},
doi = {10.1088/2053-1583/ab1607},
journal = {2D Materials},
number = [3],
volume = [6],
place = {United Kingdom},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1088/2053-1583/ab1607

Citation Metrics:
Cited by: 5 works
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    Works referencing / citing this record:

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