Topologically-protected metallic states induced by a one-dimensional extended defect in a 2D topological insulator

Abstract

We report ab initio calculations showing that a single one-dimensional extended defect can originate topologically-protected metallic states in the bulk of two-dimensional topological insulators. We find that a narrow extended defect composed of periodic units consisting of one octogonal and two pentagonal rings embedded in the hexagonal bulk of a bismuth bilayer introduces two pairs of one-dimensional Dirac-fermion states with opposite spin-momentum locking. Although both Dirac pairs are localized along the extended-defect core, their interactions are screened due to the trivial topological nature of the extended defect.

6 pages, 4 figures, 2 tables

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Cited by in corpus (9)

• The translational side of topological band insulators
• Toward Realistic Amorphous Topological Insulators
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• At the verge of topology: vacancy-driven quantum spin Hall in trivial insulators
• RKKY interactions mediated by topological states in transition metal doped bismuthene
• Hybrid-Order Topological Phase And Transition in 1H Transition Metal Compounds
• Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator
• Line defects in infinite networks of resistors
• Lifting topological protection in a quantum spin Hall insulator by edge coupling