Corner states in second-order mechanical topological insulator

2020/09/08 by Chun‐Wei Chen, Rajesh Chaunsali, Chen, Chun-Wei +7 · 4 citations
Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Photorefractive and Nonlinear Optics #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.2009.03525

openalex publication_date 2020/09/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We numerically and experimentally study corner states in a continuous elastic plate with em-bedded bolts in a hexagonal pattern. While preserving C6 crystalline symmetry, the system can transition from a topologically trivial to a non-trivial configuration. We create interfacial corners of 60° and 120° by adjoining trivial and non-trivial topological configurations. Due to the rich interaction between the bolts and the continuous elastic plate, we find a variety of corner states with and without topological origin. Notably, some of the corner states are highly localized and tunable. By taking advantage of this property, we experimentally demonstrate one-way corner localization in a Z-shaped domain wall.

Cited by

• Field localisation and spin-momentum locking in zero-dimensional dissipative topological photonic interface state
• Hierarchical Topological States without Dimension Reduction
• Sequential topology: iterative topological phase transitions in finite chiral structures
• Quasi-BICs due to symmetry mismatch in architected elastic plates

Related

• Active control of higher-order topological corner states in a piezoelectric elastic plate
• Corner states are not topologically protected
• Topological defect-mediated corner states and higher-order bulk topology in a two-dimensional crystalline insulator
• Tunable corner states in topological insulators with long-range hoppings and diverse shapes
• Universal theory of tunable second-order topological corner states induced by interlayer coupling in twist bilayer Chern insulators