Abstract
We propose a realization of higher-order topological phases in a spring-mass model with a breathing kagome structure. To demonstrate the existence of the higher-order topological phases, we characterize the topological properties and show that the corner states appear under the fixed boundary condition. To characterize the topological properties, we introduce a formula for the Berry phases in the Brillouin zone. From the numerical result of this Berry phase, we have elucidated that coupling between the longitudinal and transverse modes yields a state characterized by the Berry phase for our mechanical breathing kagome model. In addition, we suggest that the corner states can be detected experimentally through a forced vibration.
3 More- Received 18 September 2019
- Accepted 6 March 2020
DOI:https://doi.org/10.1103/PhysRevB.101.094107
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