Fig. 2: TKE in β-alumina ion conductors.
From: The persistence of memory in ionic conduction probed by nonlinear optics
a, Time-domain traces of transient birefringence in β-alumina ion conductors: Na+ (orange), K+ (blue), Ag+ (pink) and electro-optic sampling trace of the pump field (green), smoothed with a 30 fs Gaussian window. The shaded regions correspond to ±1 s.e. of the mean signal at each time delay. The labelled feature at 8.4 ps is the rotational coherence of atmospheric nitrogen50 within a Rayleigh length (greater than 500 μm) of the samples (below 30 μm in thickness). b, Fast Fourier-transform (FFT) power spectra (points) of the signals in a, and smoothed with a Gaussian filter of 0.1 THz s.d. (lines), with peaks highlighted by arrows.
