Edge-Dependent Topology in Kekulé Lattices

S. E. Freeney; J. J. Van Den Broeke; A. J.J. Harsveld Van Der Veen; I. Swart; C. Morais Smith

doi:10.1103/PhysRevLett.124.236404

Edge-Dependent Topology in Kekulé Lattices

S. E. Freeney
, J. J. Van Den Broeke
, A. J.J. Harsveld Van Der Veen
, I. Swart
, C. Morais Smith

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The boundary states of topological insulators are thought not to depend on the precise atomic structure of the boundary. A recent theoretical study showed that, for topological crystalline insulators with given bond strengths, topological states should only emerge for certain edge geometries. We experimentally probe this effect by creating artificial Kekulé lattices with different atomically well-defined edge geometries and hopping ratios in a scanning tunneling microscope. Topological edge modes are found to only appear for specific combinations of edge geometry and hopping ratio.

Original language	English
Article number	236404
Number of pages	5
Journal	Physical Review Letters
Volume	124
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.124.236404
Publication status	Published - 12 Jun 2020

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abstract = "The boundary states of topological insulators are thought not to depend on the precise atomic structure of the boundary. A recent theoretical study showed that, for topological crystalline insulators with given bond strengths, topological states should only emerge for certain edge geometries. We experimentally probe this effect by creating artificial Kekul{\'e} lattices with different atomically well-defined edge geometries and hopping ratios in a scanning tunneling microscope. Topological edge modes are found to only appear for specific combinations of edge geometry and hopping ratio.",

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AU - Swart, I.

AU - Morais Smith, C.

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Edge-Dependent Topology in Kekulé Lattices

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