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

@article{Kovalev2020NonperturbativeTH,
  title={Non-perturbative terahertz high-harmonic generation in the three-dimensional Dirac semimetal Cd3As2},
  author={Sergey Kovalev and Renato M. A. Dantas and Semyon Germanskiy and Jan-Christoph Deinert and Bertram Green and Igor E. Ilyakov and Nilesh Awari and Min Chen and Mohammed Bawatna and Jiwei Ling and Faxian Xiu and Paul H. M. van Loosdrecht and Piotr Sur{\'o}wka and Takashi Oka and Zhe Wang},
  journal={Nature Communications},
  year={2020},
  volume={11}
}
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… 

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