2026-09-14 物質・材料研究機構
図: (左) 今回使用したトリプチセン誘導体の分子構造。 (中央) トリプチセン誘導体を集積して作製した超分子の形状(上)およびその端に存在するトポロジカルエッジ状態(下)を示す走査トンネル顕微鏡像。 (右) トリプチセン誘導体からできた超分子の模式図。プロペラ状のグレーの領域がトリプチセン誘導体を表す。
＜関連情報＞
- https://www.nims.go.jp/press/2026/09/202609140.html
- https://pubs.acs.org/nalefd/article/doi/10.1021/acs.nanolett.6c03195/5404181/Direct-Observation-of-the-Zigzag-Edge-States-of-a
超分子二原子カゴメ格子のジグザグエッジ状態の直接観察 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
Nano Letters Published:September 02, 2026
DOI:https://doi.org/10.1021/acs.nanolett.6c03195
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, nonplanar 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.
