Dresden 2026 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 41: Development of Calculation Methods II

MM 41.8: Talk

Friday, March 13, 2026, 12:15–12:30, SCH/A251

Detecting topologically-protected surface states in doped systems using the coherent potential approximation — •Artem Chmeruk, Dylan Jones, and Liviu Chioncel — University of Augsburg, Augsburg, Germany

The signature of the non-trivial electronic band structure is the existence of gapless conducting states at interfaces where the topological invariant changes. This change signals a topological phase transition, which in real systems can be accomplished through doping. Modeling doping effects can be done by combining density functional theory and coherent potential approximation, which gives the possibility to model a continuous range of concentrations, and provides a sensitive probe to detect the emergent electronic states. Here, we analyse the topologically-protected surface states in Bi_2−xSb_xSe₃.

Keywords: Topology; DFT; CPA; Alloys; Bands