Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 7: Surface Magnetism and Topological Insulators (joint session MA/TT)
TT 7.9: Talk
Monday, March 9, 2026, 11:45–12:00, POT/0351
Topologically non-trivial Kondo insulating state in graphene nanoribbons — •Amogh Kinikar1,2, Guangze Chen3, Yanwei Gu4, David Jacob5,6, Joaquín Fernández-Rossier7, Gonçalo Catarina2, António T. Costa7, Oliver Gröning2, Carlo Antonio Pignedoli2, Klaus Müllen4, Pascal Ruffieux2, Jose L. Lado8, Akimitsu Narita4, and Roman Fasel2,9 — 1KIT, Karlsruhe, Germany — 2Empa, Dübendorf, Switzerland — 3Chalmers University of Technology, Gothenburg, Sweden — 4MPIP, Mainz, Germany — 5UPV/EHU, San Sebastián, Spain — 6Basque Foundation for Science,Bilbao, Spain — 7INL, Braga, Portugal — 8Aalto University, Espoo, Finland — 9University of Bern, Bern, Switzerland
Metallic rare-earth alloys display characteristic correlated electron phenomena due to interactions between electrons which give rise to a narrow heavy-fermion band near the Fermi level that hybridizes with the metallic band and opens a hybridization gap. When the Fermi level falls within this gap the system forms a Kondo insulator, which can also acquire a topologically non-trivial character. Here we provide evidence for a topological Kondo insulating state in a specific atomically precise graphene nanoribbon synthesized on Au(111) by on surface methods and characterized by scanning probe microscopy. We observe a sharp resonance near the Fermi level and a pronounced zero-bias peak at the ribbon termini. We show that these spectroscopic signatures are a fingerprint of a topological Kondo insulating state in this graphene nanoribbon.
Keywords: heavy fermions; topological Kondo insulators; electron spin