Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Focus Session: Functional Molecules at Surfaces I
O 7.9: Vortrag
Montag, 16. März 2020, 12:45–13:00, TRE Ma
Tailoring topological order and π-conjugation to engineer quasi-metallic polymers — •Shayan Edalatmanesh1, Borja Cirera2, Ana Sánchez-Grande2, Bruno de la Torre1,3, José Santos2,5, Eider Rodríguez-Sánchez2,5, Koen Lauwaet2, Benjamin Mallada1, Radek Zbořil1, Rodolfo Miranda2,6, Oliver Gröning4, Pavel Jelínek1,3, Nazario Martín2,5, and David Écija2 — 1Regional Centre of Advanced Technologies and Materials, Czechia — 2IMDEA Nanociencia, Spain — 3Institute of Physics, The Czech Academy of Sciences — 4EMPA, Swiss Federal Laboratories for Materials Science and Technology — 5Universidad Complutense, Spain — 6Universidad Autónoma de Madrid, Spain
Topological band theory provides a conceptual framework to predict or even engineer robust metallic states at the boundaries of topologically distinct phases. The bulk-boundary correspondence requires that a topological electronic phase transition between two insulators must proceed via closing of the electronic gap. Therefore, it can provide a conceptual solution to the instability of metallic phases in π-conjugated 1D polymers.
In this work, we demonstrated that on-surface chemical reactions of molecular precursors on pristine Au(111) surfaces result in the formation of long, defect-free, π-conjugated polymers featuring a topological non-trivial SSH quantum phase, with a very narrow bandgap due to the proximity to the point of topological transition, in-gap zero-energy edge-states and electronic transformation of the π-conjugated polymers.