Fig. 4: Experimental observation of selection rules in a symmetry broken system due to real-synthetic symmetries.
From: Selection rules in symmetry-broken systems by symmetries in synthetic dimensions
a–c Deviations of harmonic amplitudes from standard selection rules as a function of QWP angle \(\theta\) for harmonic orders 18.8, 19.75, and 20.7. The scaling of each harmonic amplitude was fit to three models within the yellow & blue shaded regions, and the best fits appear in the corresponding color above each subfigure. d \({R}^{2}\) values for all numerical fits. The best fits for each harmonic are marked in yellow in blue.
