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Experimental Determination of Wannier Centers in 1D topological chains
- Publication Year :
- 2024
-
Abstract
- The hallmark of topological crystalline insulators is the emergence of a robust electronic state in a bandgap localized at the boundary of the material. However, end, edge, and surface states can also have a non-topological origin. Unfortunately, topological invariants such as the winding number and Zak-phase are often not directly experimentally accessible for solids. In addition to topological invariants, the position of the Wannier centers provide a fingerprint for the topological character of a material. Here, we demonstrate a method to experimentally determine the location of Wannier centers in artificial lattices made of Cs/InAs(111)A by integrating the density of states. We determine the locations of the Wannier centers for various 1D chains, topological and trivial, and corroborate our findings with tight-binding simulations.
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2407.14465
- Document Type :
- Working Paper