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  Strong and fragile topological Dirac semimetals with higher-order Fermi arcs

Wieder, B. J., Wang, Z., Cano, J., Dai, X., Schoop, L. M., Bradlyn, B., et al. (2020). Strong and fragile topological Dirac semimetals with higher-order Fermi arcs. Nature Communications, 11: 627. doi:10.1038/s41467-020-14443-5.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0008-80A6-B Version Permalink: https://hdl.handle.net/21.11116/0000-000F-CF0A-E
Genre: Journal Article

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 Creators:
Wieder, Benjamin J.1, Author
Wang, Zhijun1, Author
Cano, Jennifer1, Author
Dai, Xi1, Author
Schoop, Leslie M.1, Author
Bradlyn, Barry1, Author
Bernevig, B. Andrei2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Max Planck Institute of Microstructure Physics, Max Planck Society, Weinberg 2, 06120 Halle, DE, ou_2415691              

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 Abstract: Dirac and Weyl semimetals both exhibit arc-like surface states. However, whereas the surface Fermi arcs in Weyl semimetals are topological consequences of the Weyl points themselves, the surface Fermi arcs in Dirac semimetals are not directly related to the bulk Dirac points, raising the question of whether there exists a topological bulk-boundary correspondence for Dirac semimetals. In this work, we discover that strong and fragile topological Dirac semimetals exhibit one-dimensional (1D) higher-order hinge Fermi arcs (HOFAs) as universal, direct consequences of their bulk 3D Dirac points. To predict HOFAs coexisting with topological surface states in solid-state Dirac semimetals, we introduce and layer a spinful model of an s–d-hybridized quadrupole insulator (QI). We develop a rigorous nested Jackiw–Rebbi formulation of QIs and HOFA states. Employing ab initio calculations, we demonstrate HOFAs in both the room- (α) and intermediate-temperature (α″) phases of Cd3As2, KMgBi, and rutile-structure (β′-) PtO2.

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 Dates: 2020-01-31
 Publication Status: Published online
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 Identifiers: BibTex Citekey: P13871
DOI: 10.1038/s41467-020-14443-5
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 Sequence Number: 627 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723