Fig. 5: Experimental observation of acoustic temporal TIMs.
From: Observation of momentum-band topology in PT-symmetric Floquet lattices
a Momentum-resolved time evolution of sound intensity simulated for a nontrivial temporal interface system. The orange and blue arrows mark the momenta \(k=0.3\pi\) and \(k=\pi\), respectively. b Sound intensities at these two momenta, with experimental data (circles) closely matching the simulations (lines). A base−10 logarithmic scale is used to better visualize the exponential behavior. The data for \(k=0.3\pi\), along with their linear-scale plot (inset), clearly show the emergence of a TIM at the temporal interface (\(t=0{{{\rm{ms}}}}\)). c, d Similar to a and b, but for a trivial temporal interface system, showing no TIM at the interface.
