# Strong terahertz third-harmonic generation by kinetic heavy quasiparticles in CaRuO$\_3$

Source: [Strong terahertz third-harmonic generation by kinetic heavy quasiparticles in CaRuO$\_3$](<https://www.sota2.com/research/paper/68fa46fb1e209131ce924785>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:54:46.750Z

Authors: C. Reinhoffer, Sven Esser, Sebastian Esser, E. A. Mashkovich, S. Germanskiy, P. Gegenwart, F. Anders, P. H. M. van Loosdrecht, Zhe Wang

Published: 2023-10-09T14:39:26.000Z

## 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.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2310.05760>)

[PDF](<https://arxiv.org/pdf/2310.05760.pdf>)