Supplementary Information Imaging GHz Zero-Group-Velocity Lamb Waves

Qingnan Xie, Sylvain Mezil∗,2 Paul H. Otsuka, Motonobu Tomoda, Jérôme Laurent, Osamu Matsuda, Zhonghua Shen, and Oliver B. Wright School of Science, Nanjing University of Science and Technology, Nanjing 210094, People’s Republic of China Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan Institut Langevin, ESPCI ParisTech, CNRS, 1 rue Jussieu, 75238 Paris Cedex 05, France