Strong terahertz third-harmonic generation by kinetic heavy quasiparticles in CaRuO${}_3$

Abstract

We report on time-resolved nonlinear terahertz spectroscopy of a strongly correlated ruthenate, CaRuO${}_3$, as a function of temperature, frequency and terahertz field strength. Third-harmonic radiation for frequencies up to 2.1 THz is observed evidently at low temperatures below 80 K, where the low-frequency linear dynamical response deviates from the Drude model and a coherent heavy quasiparticle band emerges by strong correlations associated with the Hund's coupling.Phenomenologically, by taking an experimentally observed frequency-dependent scattering rate, the deviation of the field driven kinetics from the Drude behavior is reconciled in a time-dependent Boltzmann description, which allows an attribution of the observed third-harmonic generation to the terahertz field driven nonlinear kinetics of the heavy quasiparticles.

arXiv comment5 pages, 3 figures

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• Anomalous terahertz nonlinearity in disordered s-wave superconductor close to the superconductor-insulator transition