Volume 142, Number 1, April 2023
|Number of page(s)||5|
|Section||Condensed matter and materials physics|
|Published online||23 March 2023|
Vacancy-superlattice–induced higher-order topological corner states in a Chern insulator
School of Sciences, Xi'an Technological University - Xi'an 710032, China
(a) E-mail: email@example.com (corresponding author)
Received: 17 October 2022
Accepted: 14 March 2023
Recent studies have discovered local potentials can induce nontrivial eigenmodes responding to the bulk topology for the system. While previous studies focused on conventional first-order topological states emerging from vacancy superlattice, here we study higher-order topological properties of the vacancy superlattice on a two-dimensional Chern insulator with particle-hole symmetry. The vacancy superlattice with alternate lattice spacings exhibits an emergent second-order topological phase characterized by the nontrivial edge polarization. This topological phase is robust against particle-hole symmetry-preserved perturbations as long as the energy gap remains open for the mid-gap states. Our work generalizes the nontrivial higher-order topological properties to a Chern insulator with local defect vacancies and provides a controllable platform for engineering higher-order topological corner states.
© 2023 EPLA
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