Fig. 1: THG from driven Higgs oscillation in LSCO(OP45).
From: Phase-resolved Higgs response in superconducting cuprates
a, b Terahertz field transmitted through LSCO(OP45) at 90 K and 28 K. A 2.1 THz bandpass filter is placed after the sample to suppress the 0.7 THz transmission (Supplementary Note 2). c, d 0.7 THz fundamental harmonic (FH) and 2.1 THz third harmonic (TH) extracted from b using 1.4 THz FFT low pass and high pass filters. e FFT power spectrum of the transmitted field at selected temperatures across Tc = 45 K. f Transmitted FH and TH power versus incoming FH field at 28 K. Solid lines are guides-to-the-eye with a slope of 2 and 6.
