2021
DOI: 10.1021/acs.jpclett.1c01249
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Robust Topological Nodal-Line Semimetals from Periodic Vacancies in Two-Dimensional Materials

Abstract: A nodal-line semimetal (NLSM) is suppressed in the presence of spin–orbit coupling unless it is protected by a nonsymmorphic symmetry. We show that two-dimensional (2D) materials can realize robust NLSMs when vacancies are introduced on the lattice. As a case study we investigate borophene, a boron honeycomb-like sheet. While the Dirac cones of pristine borophene are shown to be gapped out by spin–orbit coupling and by magnetic exchange, robust nodal lines (NLs) emerge in the spectrum when selected atoms are r… Show more

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Cited by 8 publications
(14 citation statements)
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“…This behavior should be distinguished from that in Ref. 18 , where the inversion-point combines with a last local constraint on the Hamiltonian to generate NLs at . Within the present framework, the influence of the inversion-point symmetry alone, i.e.…”
Section: Resultsmentioning
confidence: 58%
See 3 more Smart Citations
“…This behavior should be distinguished from that in Ref. 18 , where the inversion-point combines with a last local constraint on the Hamiltonian to generate NLs at . Within the present framework, the influence of the inversion-point symmetry alone, i.e.…”
Section: Resultsmentioning
confidence: 58%
“…These nodal points, which were not unveiled in Ref. 18 , are the precursors of symmetry-enforced NLs.
Figure 3 ( a ) Doubly-degenerate eigenvalues of the glide-plane matrix winding around the half-unit circles on the complex plane, one pair of eigenvalues from to i through 1, and the other pair from i to through − 1.
…”
Section: Resultsmentioning
confidence: 78%
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“…We proceed to demonstrate that the proposed mechanism can coexist with another vacancy engineering principle proposed recently, namely the nodalline semimetals caused by 2D nonsymmorphic vacancy configurations. [50][51][52] In these nonsymmorphic configurations, every two carbon atoms map to each other under glide plane operation, resulting in nodal lines at the BZ boundary regardless the details of the Hamiltonian, which serves as a vacancy-engineering principle to ob-tain symmetry-enforced nodal lines. [53][54][55][56] As an example, in Fig.…”
Section: Coexistence Of Zefbs and Nodal Linesmentioning
confidence: 99%