[10a-E207-1~6] 22.1 Joint Session M "Phonon Engineering"

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[10a-E207-3] Restoration of topological protection by adiabatic-geometry-induced suppression of intervalley mixing

〇Keita Funayama¹, Jotaro Nakane¹, Ai Yamakage² (1.Toyota Cent. Labs., 2.Nagoya Univ.)

Keywords:

Topological phononics,elastic waveguide,Micro-electromechanical systems (MEMS)

Quantum valley-hole (QVH) systems are highly compatible engineering design and implementation, and are expected to find applications in topological wave systems. However, at the so-called “armchair-type” boundary of QVH systems, valley-state mixing occurs, which weakens the topological protection of waves. In this presentation, we report on the results of an investigation using elastic waveguides to examine the process of decoupling valley states and restoring topological protection at armchair-type boundaries through adiabatic geometric structures.