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<p>Heterostructures of stacked two-dimensional lattices have shown great promise for engineering novel material properties. As an archetypal example of such a system, the hexagon-shared honeycomb-kagome lattice has been experimentally synthesized in various material platforms. In this work, we explore three rotationally symmetric variants of the honeycomb-kagome lattice: the <i>hexagonal</i>, <i>triagonal</i>, and <i>biaxial</i> phases. While the triagonal and biaxial phases exhibit trivial insulating and Dirac semimetal band structures, respectively, the hexagonal phase hosts a higher-order topological phase driven by band inversion near the <i>Γ</i>-point. This highlights a key distinction from the conventional band inversions at the <i>K</i>-point observed in hexagonal homobilayer systems. Furthermore, we demonstrate how the distinct topological properties of these phases result in network band structures within moiré heterostructures formed by twisted or lattice-mismatched HK systems. These network band structures can be experimentally observed through extrinsic twisting or intrinsic lattice mismatch between the honeycomb and kagome systems.</p>

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Stacking-dependent topological electronic structures in honeycomb-kagome heterolayers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Chan Bin Bark,
  • Hanbyul Kim,
  • Seik Pak,
  • Hong-Guk Min,
  • Sungkyun Ahn,
  • Youngkuk Kim,
  • Moon Jip Park

摘要

Heterostructures of stacked two-dimensional lattices have shown great promise for engineering novel material properties. As an archetypal example of such a system, the hexagon-shared honeycomb-kagome lattice has been experimentally synthesized in various material platforms. In this work, we explore three rotationally symmetric variants of the honeycomb-kagome lattice: the hexagonal, triagonal, and biaxial phases. While the triagonal and biaxial phases exhibit trivial insulating and Dirac semimetal band structures, respectively, the hexagonal phase hosts a higher-order topological phase driven by band inversion near the Γ-point. This highlights a key distinction from the conventional band inversions at the K-point observed in hexagonal homobilayer systems. Furthermore, we demonstrate how the distinct topological properties of these phases result in network band structures within moiré heterostructures formed by twisted or lattice-mismatched HK systems. These network band structures can be experimentally observed through extrinsic twisting or intrinsic lattice mismatch between the honeycomb and kagome systems.