• Corpus ID: 235458102

Higher-order topological insulators from $3Q$ charge bond orders on hexagonal lattices: A hint to kagome metals

@inproceedings{Lin2021HigherorderTI,
  title={Higher-order topological insulators from \$3Q\$ charge bond orders on hexagonal lattices: A hint to kagome metals},
  author={Yu-Ping Lin},
  year={2021}
}
We show that unconventional boundary phenonema appear in the 3Q charge bond orders on hexagonal lattices. At the saddle points with Van Hove singularity, the 3Q orders can develop at three nesting momenta. An insulator can develop from the bond modulations, where the C6 symmetry is respected. On the kagome lattice, in-gap corner states arise and carry fractional corner charges 2e/3. Such corner phenomena originates from the corner filling anomaly and indicates a higher-order topological… 

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