[17a-Z29-1~10] 22.1 Joint Session M "Phonon Engineering"

[17a-Z29-1] Demonstration of topological boundary modes in a one-dimensional phononic system

〇Motonobu Tomoda¹, Koya Tajima¹, Hayato Takeda¹, Osamu Matsuda¹, Oliver B. Wright¹ (1.Hokkaido Univ.)

Keywords:topology, bulk-edge correspondence, metamaterial

A wave machine is used to demonstrate the topological boundary modes of wave phenomena in classical dynamical systems. By adding additional weights to the tips of periodically selected rods of the wave machine, or by changing the distance between the rods periodically, optical branches and band gaps are added into the dispersion relation. The discontinuous portion can be regarded as a bulk interface between two different topological phases, and a topological boundary mode is generated there.