Higher-order topological phases in a spring-mass model on a breathing kagome lattice

Article

关键词: CORNER STATES;    EDGE STATES;    REALIZATION;   

DOI  :  10.1103/PhysRevB.101.094107

来源: SCIE

【 摘 要 】

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 Z(3) Berry phases in the Brillouin zone. From the numerical result of this Z(3) Berry phase, we have elucidated that coupling between the longitudinal and transverse modes yields a state characterized by the Berry phase 2 pi/3 for our mechanical breathing kagome model. In addition, we suggest that the corner states can be detected experimentally through a forced vibration.

【 授权许可】

Free