Non-perturbative terahertz high-harmonic generation in the three-dimensional 
Dirac semimetal Cd3As2

Kovalev, Sergey; Dantas, Renato M. A.; Germanskiy, Semyon; Deinert, Jan-Christoph; Green, Bertram; Ilyakov, Igor Ilyakov; Awari, Nilesh; Chen, Min; Bawatna, Mohammed; Ling, Jiwei; Xiu, Faxian; van Loosdrecht, Paul H. M.; Surówka, Piotr; Oka, Takashi; Wang, Zhe

doi:10.1038/s41467-020-16133-8

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Non-perturbative terahertz high-harmonic generation in the three-dimensional Dirac semimetal Cd₃As₂

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Oka, Takashi
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Kovalev, S., Dantas, R. M. A., Germanskiy, S., Deinert, J.-C., Green, B., Ilyakov, I. I., et al. (2020). Non-perturbative terahertz high-harmonic generation in the three-dimensional Dirac semimetal Cd₃As₂. Nature Communications, 11: 2451, pp. 1-6. doi:10.1038/s41467-020-16133-8.

Cite as: https://hdl.handle.net/21.11116/0000-0006-76CB-1

Abstract

Harmonic generation is a general characteristic of driven nonlinear systems, and serves as an efficient tool for investigating the fundamental principles that govern the ultrafast nonlinear dynamics. Here, we report on terahertz-field driven high-harmonic generation in the three-dimensional Dirac semimetal Cd3As2 at room temperature. Excited by linearly-polarized multi-cycle terahertz pulses, the third-, fifth-, and seventh-order harmonic generation is very efficient and detected via time-resolved spectroscopic techniques. The observed harmonic radiation is further studied as a function of pump-pulse fluence. Their fluence dependence is found to deviate evidently from the expected power-law dependence in the perturbative regime. The observed highly non-perturbative behavior is reproduced based on our analysis of the intraband kinetics of the terahertz-field driven nonequilibrium state using the Boltzmann transport theory. Our results indicate that the driven nonlinear kinetics of the Dirac electrons plays the central role for the observed highly nonlinear response. © 2020, The Author(s).