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 journalArticleAcademicpeer-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 languageEnglish
Article number236404
Number of pages5
JournalPhysical Review Letters
Volume124
Issue number23
DOIs
Publication statusPublished - 12 Jun 2020

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