Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Monday: Topology and Symmetry-Protected Materials
O 21.2: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Electronic Structure of the Weak 3D Topological Insulator Candidate Bi12Rh3Ag6I9 — •Johannes Heßdörfer1,2, Eduardo Carillo-Aravena2,3, Armando Consiglio2,4, Michael Ruck2,3, Domenico Di Sante5, and Friedrich Reinert1,2 — 1Experimentelle Physik VII, Universität Würzburg, Würzburg, Germany — 2Würzburg-Dresden Cluster of Excellence ct.qmat, Würzburg Dresden, Germany — 3Anorganische Chemie II, Technische Universität Dresden, Germany — 4Theoretische Physik I, Universität Würzburg, Würzburg, Germany — 5University of Bologna, Bologna, Italy
The electronic structure of Bi12Rh3Ag6I9, a weak topological insulator (TI) candidate, is investigated by means of angle-resolved photoelectron spectroscopy (ARPES) and density functional theory calculations. The compound consists of alternating layers of a 2D TI in a Kagome configuration, separated by insulating spacer layers. The Kagome net is formed by rhodium centered bismuth cubes, while the spacer consists of silver and iodine. The results are compared to the mother material Bi14Rh3I9 [1], denoting the first experimentally observed weak TI. In particular, the influence of the silver substitution into the spacer layer and the potential modification of the coupling between the 2D TI layers is discussed.
[1]Rasche et al., Nature Mater, 12, 422-425 (2013)