Fig. 7.

Multi-states in the bandgap of NAM plate. Frequency is 760 Hz. a Response amplitudes v _rsp at points A and B varying against the linearly and continuously varied driving amplitude v _ex in time domain, i.e., the varying-amplitude experiment (see Methods). In the legend, Increase (decrease) refers to the process increasing (decreasing) v _ex. Black arrows show the varying routes. b Contour plot of the transmission difference ΔT _v between v _e1 = 3.13 and v _e2 = 8.55 labeled in a, ΔT _v = T _v2−T _v1. Scanning experiments were carried out to obtain this plot