Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures II
O 23.4: Vortrag
Dienstag, 13. März 2018, 11:30–11:45, MA 004
Novel approach to grow 2D organic topological insulators by on-surface synthesis — •Fabian Schulz1, Guoxian Zhang2, Gerhard Meyer1, Julian Chan2, and Leo Gross1 — 1IBM Research - Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland — 2University of Ottawa, 120 D’Iorio Hall, Ottawa ON, K1N 6N5, Canada
Honeycomb lattices comprising metal atoms with strong spin-orbit coupling connected by organic linker molecules are predicted to host topologically protected conducting edge states, thus giving rise to two-dimensional organic topological insulators (TIs) [1]. One possible route to create such structures experimentally are self-assembled metal-organic coordination networks grown on surfaces [2]. However, these networks are usually not fully covalently bonded, which would be desirable for realizing organic TIs. Even though there are several strategies to form covalent bonds by on-surface synthesis [3], those are rarely applied to grow metal-organic structures.
Here, the possibility to grow organic TIs by on-surface synthesis is explored. We use atomic force microscopy with CO-functionalized tips to study surface-assisted Ullmann coupling of tris(4-iodobenzene)bismuthine complexes on Ag(111). Our results reveal important challenges that need to be overcome in order for this novel approach to succeed.
[1] Z.F. Wang et al., Nat. Commun. 4, 1471 (2013).
[2] L. Dong et al., Prog. Surf. Sci. 91, 101 (2016).
[3] G. Franc et al., Phys. Chem. Chem. Phys. 13, 14283 (2011).