Edge-Dependent Topology in Kekulé Lattices
Publication date
2020-06-12
Authors
Freeney, Saoirsé E.
Van Den Broeke, J. J.
Harsveld Van Der Veen, A. J.J.
Swart, Ingmar
de Morais Smith, Cristiane
Editors
Advisors
Supervisors
Document Type
Article
Metadata
Show full item recordCollections
License
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.
Keywords
Citation
Freeney, S E, Van Den Broeke, J J, Harsveld Van Der Veen, A J J, Swart, I & Morais Smith, C 2020, 'Edge-Dependent Topology in Kekulé Lattices', Physical Review Letters, vol. 124, no. 23, 236404 . https://doi.org/10.1103/PhysRevLett.124.236404