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

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.

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Kovalev, Sergey1, Author
Dantas, Renato M. A.1, Author
Germanskiy, Semyon1, Author
Deinert, Jan-Christoph1, Author
Green, Bertram1, Author
Ilyakov, Igor Ilyakov1, Author
Awari, Nilesh1, Author
Chen, Min1, Author
Bawatna, Mohammed1, Author
Ling, Jiwei1, Author
Xiu, Faxian1, Author
van Loosdrecht, Paul H. M.1, Author
Surówka, Piotr1, Author
Oka, Takashi2, Author           
Wang, Zhe1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 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).

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Language(s): eng - English
 Dates: 2020-05-152020-05-15
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41467-020-16133-8
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 11 Sequence Number: 2451 Start / End Page: 1 - 6 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723