Distinct terahertz third-harmonic generation of many-body excitonic states

Abstract

The dynamics of an electron-hole plasma governed by strong Coulomb interaction is a challenging many-body problem.We report on experimental realization of electron-hole many-body states in the picosecond time scale, with tunable densities in a representative semiconductor Cu${}_2$O. By using time-resolved optical-pump terahertz third-harmonic-generation spectroscopy, we study the nonlinear terahertz dynamical characteristics of the many-body electron-hole states. We find not only efficient and nonperturbative terahertz third-harmonic yield associated with the excitonic formation, but also a nonmonotonic dependence of the excitonic nonlinear response on the electron-hole density, reflecting the exciton dissociation at high charge density. Our results provide an efficient excitonic sensing of the far-from-equilibrium electron-hole many-body states.

arXiv comment5 pages, 4 figures

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Cited by in corpus (2)

• Terahertz third-harmonic generation of lightwave driven Weyl fermions far from equilibrium
• Giant enhancement of terahertz high-harmonic generation by cavity engineering of a three-dimensional Dirac semimetal