1. Multi-branch valley-chiral edge states of antisymmetric plate wave in phononic crystal plates with double-sided symmetric pillars
- Author
-
Zheng Zhong, Jinfeng Zhao, Weitao Yuan, Yang Long, and Jie Ren
- Subjects
Physics ,Condensed matter physics ,Antisymmetric relation ,Mechanical Engineering ,Phase (waves) ,02 engineering and technology ,Bending ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Rotation ,Transverse plane ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Mechanics of Materials ,Homogeneous space ,General Materials Science ,Hexagonal lattice ,Symmetry breaking ,0210 nano-technology ,Civil and Structural Engineering - Abstract
We build up phononic crystals (PCs) by attaching triangular pillars symmetrically to the double sides of a thin plate in the triangular lattice. The degeneracy of multiple Dirac cones is simultaneously lifted for the same PC plate, due to the mirror-inversion symmetry breaking caused by the rotation of triangular pillars; opposite Berry curves and valley Chern number are got at the lower and upper branches of each valley band. The multi-branch topological protected edge states are then created on the interface between PC plates with opposite topological phase. Interestingly enough, those edge states present various transverse symmetries and distinct robustness against sample imperfection such as cavity defect, rotation angle disorder, or sharp bending. Our results present the rich behaviors of multiple branches of topological edges.
- Published
- 2021