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O: Fachverband Oberflächenphysik
O 89: Spins on surfaces at the atomic scale II
O 89.6: Vortrag
Donnerstag, 12. März 2026, 16:15–16:30, WILL/A317
Topological End States of Chiral Graphene Nanoribbons on Proximitized Superconducting Au (111) — •Trisha Sai1, Frederik Bauer1, Stefano Trivini1, and Jose Ignacio Pascual1,2 — 1CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain — 2Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain
Graphene nano-structures may host localized magnetic moments characterized by their geometry, heteroatom substitution, topological frustration, or bulk-boundary correspondence. However, observation of their open-shell configuration via on-surface synthesis can be inhibited due to charge transfer. This is in the case of (3, 2, 8) chiral graphene nanoribbons (chGNRs) synthesized on Au(111), whose symmetry-protected topological end states (SPTES) are quenched due to electron depopulation. In this work, we synthesize (3, 2, 8) chGNRs on thin films of Au (111) grown on a superconducting Nb (110) single crystal. Through controlled deposition of monolayers of Au, we observe a modulation in the surface state of Au (111), thereby a reduction in the work function of the resulting platform. Moreover, the substrate is also complemented with proximity induced superconductivity. Low-Temperature scanning tunneling spectroscopic (STS) measurements reveal that the SPTES of (3, 2, 8) chGNRs are retained in a mixed-valence regime where their spectral weight is distributed between an in gap Yu-Shiba-Rusinov (YSR) state and an orbital state close to Fermi energy. In case of a depopulated terminus, the YSR states are weak and suppressed while the orbital state is more pronounced.
Keywords: Graphene Nanoribbons; Yu-Shiba-Rusinov States; Proximity induced Superconductivity; Scanning Tunneling Microscopy; On-Surface Synthesis