Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: THz and MIR

HL 35.2: Talk

Wednesday, March 20, 2024, 15:15–15:30, EW 203

Nonlinear terahertz responses of optically excited Cu ₂ O — •Changqing Zhu, Anneke Reinold, Patrick Pilch, Marc Assmann, and Zhe Wang — TU Dortmund University, Germany

Excitons in Cu ₂ O have attracted significant attention due to their peculiar properties, such as the remarkable Rydberg series with the principal quantum number extending up to 30 and the realization of Bose-Einstein condensation. We report on time-resolved nonlinear terahertz spectroscopic study of optically excited nonequilibrium states in Cu ₂ O. Terahertz harmonic generation is observed and investigated as a function of the fluence of the optical excitation and by varying the delay between the optical excitation and the terahertz driving pulse. Our time-resolved spectroscopic techniques allow us to associate the observed nonlinear terahertz responses with different processes of exciton-related dynamics.

Keywords: Nonlinear THz spectroscopy; Terahertz harmonic generation; Exciton dynamics