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arXiv · 2610.18539

Imaging Gate-Tunable Single-Layer Molecular Kagome Lattices

Ziyi Wang·Rafal Zuzak·Weichen Tang·Haowen Pang·Yutang Qiao·Dhanvanth Balakrishnan·Yuqiao Yan·Aining Hu·Andrew Sun·Takashi Taniguchi·Kenji Watanabe·Feng Wang·Steven G. Louie·Michael F. Crommie
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Abstract

Kagome lattices provide a simple geometry for engineering electronic states that exhibit novel quantum behavior. In conventional kagome materials, however, the relevant states are often embedded in chemically complex three-dimensional crystals and are difficult to isolate or tune. Molecule-based kagome networks offer structural precision and tunability, but have largely been confined to metallic substrates incompatible with 2D devices. Here we report growth of single-layer Ni$_3$(HITP)$_2$ metal-organic frameworks (MOFs) on van der Waals substrates including graphene-based field-effect devices using metal-salt molecular beam epitaxy. Low-temperature scanning tunneling spectroscopy resolves kagome-derived flat-band and van Hove singularity-based spectral features consistent with first-principles calculations. Gating hybrid 2D MOF devices allows us to energetically shift kagome spectral features, thus establishing electrostatic control of chemically programmable 2D kagome electronic lattices.

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Ziyi Wang, Rafal Zuzak, Weichen Tang, Haowen Pang, Yutang Qiao, Dhanvanth Balakrishnan, Yuqiao Yan, Aining Hu, Andrew Sun, Takashi Taniguchi, Kenji Watanabe, Feng Wang, Steven G. Louie, Michael F. Crommie. 2026-10-13. Imaging Gate-Tunable Single-Layer Molecular Kagome Lattices. https://arxiv.org/abs/2610.18539

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