Download file (1.55 MB)
Download as zip (1.42 MB)

Collection

Citation

Description:

The honeycomb lattice is a fundamental two-dimensional (2D) network that gives rise to surprisingly rich electronic properties. While its expansion to 2D supramolecular assembly is conceptually appealing, its realization is not straightforward because of weak intermolecular coupling and strong influence of a supporting substrate. Here we show that the application of a triptycene derivative with phenazine moieties, Trip-Phz, solves this problem due to its strong intermolecular π-π pancake bonding and non-planar geometry. Our scanning tunneling microscopy (STM) measurements demonstrate that Trip-Phz molecules self-assemble on a Ag(111) surface to form chiral and commensurate honeycomb lattices. Electronically, the network can be viewed as a hybrid of honeycomb and kagome lattices. The Dirac and flat bands predicted by a simple tight-binding model are reproduced by total density functional theory (DFT) calculations, highlighting the protection of the molecular bands from the Ag(111) substrate. The present work offers a rational route for creating chiral 2D supramolecules that can accommodate pristine Dirac and flat bands simultaneously.

Rights:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsnano.4c04496

Keyword: Honeycomb lattice, Kagome lattice, self assembly, scanning tunneling microscopy, Dirac bands, flat bands, chirality

Date published: 2024-06-30

Publisher: American Chemical Society (ACS)

Journal:

• ACS Nano (ISSN: 19360851) vol. 18 issue. 30

Funding:

• Ministry of Education, Culture, Sports, Science and Technology (World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics)
• Precursory Research for Embryonic Science and Technology JPMJPR21A9
• Japan Society for the Promotion of Science 20H02707
• Japan Society for the Promotion of Science 20H05621
• Japan Society for the Promotion of Science 22H0196

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4625

First published URL: https://doi.org/10.1021/acsnano.4c04496

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-06-30 08:30:16 +0900

Published on MDR: 2025-06-30 08:18:07 +0900