Population inversion and ultrafast terahertz nonlinearity of transient Dirac 
fermions in Cd3As2

Zhu, Changqing; Pilch, Patrick; Dantas, Renato M. A.; Reinold, Anneke; Yang, Yunkun; Xiu, Faxian; Bedoya-Pinto, Amilcar; Parkin, Stuart S. P.; Moessner, Roderich; Wang, Zhe

doi:10.1103/PhysRevB.109.L201111

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Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd₃As₂

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Bedoya-Pinto, Amilcar
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin, Stuart S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.109.L201111
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Citation

Zhu, C., Pilch, P., Dantas, R. M. A., Reinold, A., Yang, Y., Xiu, F., et al. (2024). Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd₃As₂. Physical Review B, 109(20): L201111. doi:10.1103/PhysRevB.109.L201111.

Cite as: https://hdl.handle.net/21.11116/0000-000F-638F-1

Abstract

Harmonic generation provides an efficient tool for the study of ultrafast nonlinear dynamics. We report on time-resolved optical-pump terahertz harmonic generation spectroscopic investigation of ultrafast nonlinearity in a prototypical three-dimensional Dirac semimetal, Cd₃⁢As₂. A transient population inversion characterized by excessive nonthermal Dirac electrons and holes is found to be very sensitive and responsive to a periodic terahertz drive, leading to very efficient terahertz third-harmonic generation. Based on the Boltzmann transport theory, we analyze the terahertz field-driven kinetics of the transient Dirac fermions that is responsible for the observed strong terahertz nonlinearity.