Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd$_3$As$_2$
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arXiv
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| Format: | Preprint |
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2024
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| author | 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 |
| author_facet | 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 |
| contents | 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 Cd$_3$As$_2$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_08257 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd$_3$As$_2$ 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 Materials Science Strongly Correlated Electrons Optics 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 Cd$_3$As$_2$. 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. |
| title | Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd$_3$As$_2$ |
| topic | Materials Science Strongly Correlated Electrons Optics |
| url | https://arxiv.org/abs/2401.08257 |