Stacking-dependent topological electronic structures in honeycomb-kagome heterolayers
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929722766655488 |
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| author | Bark, Chan Bin Kim, Hanbyul Pak, Seik Min, Hong-Guk Ahn, Sungkyun Kim, Youngkuk Park, Moon Jip |
| author_facet | Bark, Chan Bin Kim, Hanbyul Pak, Seik Min, Hong-Guk Ahn, Sungkyun Kim, Youngkuk Park, Moon Jip |
| contents | 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 mismatching between the honeycomb and kagome systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_14861 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stacking-dependent topological electronic structures in honeycomb-kagome heterolayers Bark, Chan Bin Kim, Hanbyul Pak, Seik Min, Hong-Guk Ahn, Sungkyun Kim, Youngkuk Park, Moon Jip Materials Science Mesoscale and Nanoscale Physics 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 mismatching between the honeycomb and kagome systems. |
| title | Stacking-dependent topological electronic structures in honeycomb-kagome heterolayers |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2502.14861 |