On‐Surface Synthesis of Nitrogen‐Doped Kagome Graphene

Nitrogen‐doped Kagome graphene (N‐KG) has been theoretically predicted as a candidate for the emergence of a topological band gap as well as unconventional superconductivity. However, its physical realization still remains very elusive. Here, we report on a substrate‐assisted reaction on Ag(111) for...

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Published in:Angewandte Chemie International Edition 2021-04, Vol.60 (15), p.8370-8375
Main Authors: Pawlak, Rémy, Liu, Xunshan, Ninova, Silviya, D'Astolfo, Philipp, Drechsel, Carl, Liu, Jung‐Ching, Häner, Robert, Decurtins, Silvio, Aschauer, Ulrich, Liu, Shi‐Xia, Meyer, Ernst
Format: Article
Language:English
Subjects:
Atomic force microscopy
density functional calculations
Density functional theory
Graphene
Kagome graphene
Kagome lattice
Microscopy
Nitrogen
on-surface synthesis
scanning probe microscopy
Scanning tunneling microscopy
Silver
Substrates
Topology
Unconventional superconductivity
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Summary:Nitrogen‐doped Kagome graphene (N‐KG) has been theoretically predicted as a candidate for the emergence of a topological band gap as well as unconventional superconductivity. However, its physical realization still remains very elusive. Here, we report on a substrate‐assisted reaction on Ag(111) for the synthesis of two‐dimensional graphene sheets possessing a long‐range honeycomb Kagome lattice. Low‐temperature scanning tunneling microscopy (STM) and atomic force microscopy (AFM) with a CO‐terminated tip supported by density functional theory (DFT) are employed to scrutinize the structural and electronic properties of the N‐KG down to the atomic scale. We demonstrate its semiconducting character due to the nitrogen doping as well as the emergence of Kagome flat bands near the Fermi level which would open new routes towards the design of graphene‐based topological materials. Nitrogen‐doped Kagome graphene is predicted to display a topological band gap and unconventional superconductivity. Two‐dimensional graphene sheets possessing a long‐range honeycomb Kagome lattice have now been synthesized by a substrate‐assisted Ullmann reaction on Ag(111). Scanning probe microscopy supported by density functional theory proves the appearance of Kagome flat bands, opening the design of graphene‐based topological materials.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202016469