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We investigate higher-order topological states in honeycomb lattice with Y-Kekulé distortions that preserve C6v crystalline symmetry. The gapped states in expanded and shrunken distortions are adiabatically connected to isolated hexamers and Y-shaped tetramer states, respectively, where the former possesses nontrivial higher-order topology characterized by a Z6 invariant. Topological corner states exist in a flake structure with expanded distortion where the hexamers are broken at the corners. Our work reveals that honeycomb lattice with Y-Kekulé distortions serves as a promising platform to study higher-order topological states.

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• In Copyright
  

  ©2024 The Physical Society of Japan

Keyword: honeycomb lattice, higher-order topology, band structure, tight-binding model

Date published: 2024-03-15

Publisher: Physical Society of Japan

Journal:

• Journal of the Physical Society of Japan (ISSN: 00319015) vol. 93 issue. 3 033703

Funding:

• JST JPMJCR18T4 (CREST)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4791

First published URL: https://doi.org/10.7566/jpsj.93.033703

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Updated at: 2024-10-02 16:30:15 +0900

Published on MDR: 2024-10-02 16:30:17 +0900