Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 22: Focus Session: Materials Discovery III – New materials and functionalities by general principles
FM 22.5: Vortrag
Freitag, 13. März 2026, 10:45–11:00, BEY/0138
Emergent High Conductivity Transport Channel in Bi12Rh3Ag6I9 Single-Crystalline Multilayer Heterostructure — •Nicolas Perez1, Eduardo Carrillo-Aravena2, Christian Niclaas Saggau1, Kornelius Nielsch1, and Michael Ruck2 — 1Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
Bi14Rh3I9-type weak 3D topological insulators (TIs) can be seen as nano-periodic multilayer heterostructures of 2D TIs spaced by topologically trivial insulators. The newest member Bi12Rh3Ag6I9 exhibits 2D cationic conductivity in the silver iodide spacer, which allows to electrochemically adjust the Fermi level, and has the widest band gap so far in this family of compounds, 286 meV. It shows strongly increasing diamagnetism at low temperatures in a field perpendicular to the layers. Magnetoresistance measurements in macroscopic crystals reveal confinement and oscillatory behaviour, which coincides with a drastic drop in resistivity both parallel and across the layers. The observation of such an effect in a crystalline multilayer structure is compatible with the theoretically predicted formation of a collective [1+1]-dimensional sheath state involving all lateral crystal faces and probably arising from tunneling between the protected edge states of the numerous closely spaced 2D TI layers. A macroscopic system of some 105 coupled spin channels appears promising for applications in spintronics and quantum computation.
Keywords: edge states; ionic conductors; layered materials; sheath state; topological insulators