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

Sergey Kovalev, Renato M. A. Dantas, Semyon Germanskiy, Jan-Christoph Deinert, Bertram Green, Igor Ilyakov, Nilesh Awari, Min Chen, Mohammed Bawatna, Jiwei Ling, Faxian Xiu, Paul H. M. Loosdrecht, Piotr Surówka, Takashi Oka () and Zhe Wang ()
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Sergey Kovalev: Helmholtz-Zentrum Dresden-Rossendorf
Renato M. A. Dantas: Max Planck Institute for the Physics of Complex Systems
Semyon Germanskiy: University of Cologne
Jan-Christoph Deinert: Helmholtz-Zentrum Dresden-Rossendorf
Bertram Green: Helmholtz-Zentrum Dresden-Rossendorf
Igor Ilyakov: Helmholtz-Zentrum Dresden-Rossendorf
Nilesh Awari: Helmholtz-Zentrum Dresden-Rossendorf
Min Chen: Helmholtz-Zentrum Dresden-Rossendorf
Mohammed Bawatna: Helmholtz-Zentrum Dresden-Rossendorf
Jiwei Ling: Fudan University
Faxian Xiu: Fudan University
Paul H. M. Loosdrecht: University of Cologne
Piotr Surówka: Max Planck Institute for the Physics of Complex Systems
Takashi Oka: Max Planck Institute for the Physics of Complex Systems
Zhe Wang: Helmholtz-Zentrum Dresden-Rossendorf

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-16133-8

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