Fig. 1: Third harmonic generation in Cd3As2.
From: Non-perturbative terahertz high-harmonic generation in the three-dimensional Dirac semimetal Cd3As2
a Time-resolved third-harmonic radiation characterized by its time-dependent electric field E(t) recorded at room temperature. b Normalized power spectra of the harmonic radiation 3f = 2.01 THz, and the excitation pulse f = 0.67 THz. c Dependence of the third-harmonic radiation intensity on the pump intensity (symbols) follows I3f ∝ I 2.5f (dashed line). Fit of the theoretical results is shown for the relaxation time τ = 10 fs (solid line). The error bars indicate the noise level at the corresponding data point.
