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Ellipticity control of terahertz high-harmonic generation in a Dirac semimetal

Semyon Germanskiy1,*, Renato M. A. Dantas2,3,†, Sergey Kovalev4, Chris Reinhoffer1, Evgeny A. Mashkovich1, Paul H. M. van Loosdrecht1, Yunkun Yang5,6, Faxian Xiu5,6, Piotr Surówka2,7,8,9 et al.

Roderich Moessner2, Takashi Oka2,10,11, and Zhe Wang1,12,‡

  • 1Institute of Physics II, University of Cologne, 50937 Cologne, Germany
  • 2Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany
  • 3Department of Physics, University of Basel, 4056 Basel, Switzerland
  • 4Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 5State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200232, China
  • 6Shanghai Qi Zhi Institute, No. 701 Yunjin Road, Xuhui District, Shanghai 200232, China
  • 7Department of Theoretical Physics, Wrocław University of Science and Technology, 50-370 Wrocław, Poland
  • 8Institute for Theoretical Physics, University of Amsterdam, 1090 GL Amsterdam, The Netherlands
  • 9Dutch Institute for Emergent Phenomena (DIEP), University of Amsterdam, 1090 GL Amsterdam, The Netherlands
  • 10The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 11Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 12Department of Physics, TU Dortmund University, 44227 Dortmund, Germany

  • *germanskiy@ph2.uni-koeln.de
  • †renatomiguel.alvesdantas@unibas.ch
  • ‡zhe.wang@tu-dortmund.de

Phys. Rev. B 106, L081127 – Published 31 August, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L081127

Abstract

We report on terahertz high-harmonic generation in a Dirac semimetal as a function of the driving-pulse ellipticity and on a theoretical study of the field-driven intraband kinetics of massless Dirac fermions. Very efficient control of the third-harmonic yield and polarization state is achieved in electron-doped Cd3As2 thin films at room temperature. The observed tunability is understood as resulting from terahertz-field-driven intraband kinetics of the Dirac fermions. Our study paves the way for exploiting the nonlinear optical properties of Dirac matter for applications in signal processing and optical communications.

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