Bound states at partial dislocation defects in multipole higher-order topological insulators

Sasha S. Yamada, Tianhe Li, Mao Lin, Christopher W. Peterson, Taylor L. Hughes and Gaurav Bahl ()
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Sasha S. Yamada: University of Illinois at Urbana-Champaign
Tianhe Li: University of Illinois at Urbana-Champaign
Mao Lin: University of Illinois at Urbana-Champaign
Christopher W. Peterson: University of Illinois at Urbana-Champaign
Taylor L. Hughes: University of Illinois at Urbana-Champaign
Gaurav Bahl: University of Illinois at Urbana-Champaign

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The bulk-boundary correspondence, which links a bulk topological property of a material to the existence of robust boundary states, is a hallmark of topological insulators. However, in crystalline topological materials the presence of boundary states in the insulating gap is not always necessary since they can be hidden in the bulk energy bands, obscured by boundary artifacts of non-topological origin, or, in the case of higher-order topology, they can be gapped altogether. Recently, exotic defects of translation symmetry called partial dislocations have been proposed to trap gapless topological modes in some materials. Here we present experimental observations of partial-dislocation-induced topological modes in 2D and 3D insulators. We particularly focus on multipole higher-order topological insulators built from circuit-based resonator arrays, since crucially they are not sensitive to full dislocation defects, and they have a sublattice structure allowing for stacking faults and partial dislocations.

Date: 2022
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DOI: 10.1038/s41467-022-29785-5

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