Fig. 2
From: Elastic pseudospin transport for integratable topological phononic circuits
Flexible elastic pathways with backscattering immunity. a–d (bottom) Photographs of different topological-protected TI–OI interfaces to demonstrate robust and flexible elastic waveguiding. The yellow dotted lines indicate exact locations of the interfaces. TI–OI interfaces with a no defect and three different defects of b an arbitrary-shaped cavity without perforated holes, c an arbitrary-shaped disorder consisting of random ordered perforated holes d a Z-shaped bend. (middle) Heat maps are calculated elastic energy-density distributions for elastic waves at a frequency (110.0 kHz) within the bulk band-gap, corresponding to the four different configurations, respectively. (top) Green and blue bars are experimental results measured along two straight lines cut through the TI–OI interfaces before and behind the defects, respectively. e Experimental measured elastic transmission spectra for the four configurations. The black curve corresponds to the case without any defects as in a, while the red, blue, and green curves correspond to the case of b, c, and d, respectively. Shadow regions correspond to the bulk bands
