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May 7, 2026Nano Letters1 citations

Nearly Flat Conduction Bands from Bond-Centered Orbital Networks in Dense C 3 N 4

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JCJianjia ChenYLYujie LiaoCHChaoyu He

Key Points

  • The study aims to explore the mechanisms behind the suppression of dispersion in conduction bands due to bond-centered orbital networks.
  • Utilized real-space analysis to examine the structural properties of C3N4.
  • Investigated the effects of strain on the conduction-band properties.
  • Developed effective bond-centered lattices to model connectivity-controlled dispersion suppression.
  • Identified a nearly flat conduction band at 0.06 eV above the minimum, with a bandwidth of only 4 meV.
  • Demonstrated that small strains can tune the flat band into the true conduction-band minimum.
  • Established the importance of bonding topology in flat-band engineering in covalent materials.

Abstract

= 0 plane with an in-plane bandwidth of only 4 meV, located just 0.06 eV above the true conduction-band minimum. Real-space analysis and effective bond-centered lattices reveal a connectivity-controlled mechanism for dispersion suppression. Moreover, very small strains can directly tune this low-lying flat band into the true conduction-band minimum while preserving weak dispersion, enhancing its experimental relevance. Our results establish bonding topology as a promising route to flat-band engineering in light-element covalent frameworks beyond conventional interference-based scenarios.

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Cite This Study

Chen et al. (2026) studied this question.

synapsesocial.com/papers/69fc2c718b49bacb8b347fbfhttps://doi.org/10.1021/acs.nanolett.6c01564
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