Fig. 6
From: Observation of nonlinear fractal higher order topological insulator
Experimentally measured output form-factor. The form-factor as a function of pulse energy in case-2 arrays with r = 0.3a (a), r = 0.5a (b), and r = 0.6a (c). First to fourth columns correspond to excitations of sites 1 to 4, respectively. Standard deviation of measured form-factor does not exceed the size of red dots
