a Band dispersion along the direction. b,c Band dispersion in the reduced 2D planes at and . d,e Equifrequency contours with for d the 3D Dirac sonic crystal and e the Weyl sonic crystal at frequencies of 12.76 kHz (WP1), 13.67 kHz (DP) and 14.06 kHz (WP2). The colour maps represent the strength of the states probed in the sonic crystal. The green dashed lines represent the calculated values obtained from full-wave simulations.
by Boyang Xie, Hui Liu, Hua Cheng, Zhengyou Liu, Jianguo Tian, and Shuqi Chen