Direct Observation
of the Zigzag Edge States of a
Supramolecular Diatomic Kagome Lattice

Ryohei Nemoto; Xiangzhi Meng; Behzad Mortezapour; Alexander Weismann; Saya Nakano; Masahisa Tsuchiizu; Ryuichi Arafune; Noriaki Takagi; Sho Nakamura; Katsunori Wakabayashi; Rie Suizu; Richard Berndt; Takashi Uchihashi; Kunio Awaga

doi:10.1021/acs.nanolett.6c03195

ジャーナル論文 Direct Observation of the Zigzag Edge States of a Supramolecular Diatomic Kagome Lattice

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Ryohei Nemoto, Xiangzhi Meng, Behzad Mortezapour, Alexander Weismann, Saya Nakano, Masahisa Tsuchiizu, Ryuichi Arafune, Noriaki Takagi, Sho Nakamura, Katsunori Wakabayashi, Rie Suizu, Richard Berndt, Takashi Uchihashi, Kunio Awaga. Direct Observation of the Zigzag Edge States of a Supramolecular Diatomic Kagome Lattice. Nano Letters. 2026, 26 (36), 12146-12152. https://doi.org/10.1021/acs.nanolett.6c03195

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(abstract)

Lattice geometry plays a fundamental role in the behavior of Bloch electrons in a crystal. The diatomic Kagome lattice, an extension of the honeycomb and Kagome lattices, is predicted to give rise to emergent and topological phenomena, but its experimental investigation has been limited thus far. Here, we fabricate a diatomic Kagome lattice through self-assembly of a triptycene derivative with phenazine moieties (Trip-Phz)—a C3 -symmetric, non-planar π-conjugated molecule. Our scanning tunneling microscopy (STM) observations show that Trip-Phz forms a highly ordered diatomic Kagome lattice terminated by zigzag-type edges on the Pb(111) surface. Combined STM measurements and tight-binding calculations provide direct evidence for the existence of the edge states that correspond to those of graphene. These states are topological edge states dictated by the quantization of the Zak phase and the bulk-edge correspondence. This work reveals an ideal platform for exploring quantum materials with unique lattice geometries using supramolecular technology.

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