Tuneable topological domain wall states in engineered atomic chains

This paper demonstrates the atomically controlled realization of trimer and coupled dimer chains using chlorine vacancies in the c(2 × 2) adsorption layer on Cu(100). The system allows for wide tuneability of domain wall modes, which are experimentally demonstrated using low-temperature scanning tunneling microscopy (STM). The study focuses on linear systems with complex unit cells, showcasing the formation of tuneable interface states between different ground states. These findings are relevant for the development of exotic quantum devices with atomically precise geometries.

Md Nurul Huda, Shawulienu Kezilebieke, Teemu Ojanen, Robert Drost, Peter Liljeroth