Purely rotational symmetry-protected topological crystalline insulator α-Bi4Br4

Chuang Han Hsu, Xiaoting Zhou, Qiong Ma, Nuh Gedik, Arun Bansil, Vitor M. Pereira, Hsin Lin, Liang Fu, Su Yang Xu, Tay Rong Chang

Research output: Contribution to journalArticle

4 Citations (Scopus)

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-Bi4Br4 as a purely rotation symmetry protected TCI. We show that the surface of Bi4Br4 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-Bi4Br4 rod. We comment on how the predicted topological features in-Bi4Br4 could be accessed experimentally.

Original languageEnglish
Article number031004
Journal2D Materials
Volume6
Issue number3
DOIs
Publication statusPublished - 2019 May 22

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Crystal symmetry
Fermions
insulators
Crystalline materials
Band structure
symmetry
fermions
hinges
Surface states
Hinges
trucks
Brillouin zones
rods
textures
Textures

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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 α-Bi4Br4 In: 2D Materials. 2019 ; Vol. 6, No. 3.
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Hsu, CH, Zhou, X, Ma, Q, Gedik, N, Bansil, A, Pereira, VM, Lin, H, Fu, L, Xu, SY & Chang, TR 2019, 'Purely rotational symmetry-protected topological crystalline insulator α-Bi4Br4 ', 2D Materials, vol. 6, no. 3, 031004. https://doi.org/10.1088/2053-1583/ab1607

Purely rotational symmetry-protected topological crystalline insulator α-Bi4Br4 . / Hsu, Chuang Han; Zhou, Xiaoting; Ma, Qiong; Gedik, Nuh; Bansil, Arun; Pereira, Vitor M.; Lin, Hsin; Fu, Liang; Xu, Su Yang; Chang, Tay Rong.

In: 2D Materials, Vol. 6, No. 3, 031004, 22.05.2019.

Research output: Contribution to journalArticle

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AU - Pereira, Vitor M.

AU - Lin, Hsin

AU - Fu, Liang

AU - Xu, Su Yang

AU - Chang, Tay Rong

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