Broadband hot-carrier dynamics in three-dimensional Dirac semimetal Cd3As2

The hot-carrier relaxation dynamics of Cd3As2 thin films has been investigated by using femtosecond pump-probe spectroscopy in a transmission geometry. A comparative study of degenerate and non-degenerate experiments reveals that hot-carrier distribution in Cd3As2 is established with a time constant...

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Bibliographic Details
Published in:Applied physics letters 2017-08, Vol.111 (9)
Main Authors: Zhu, Chunhui, Yuan, Xiang, Xiu, Faxian, Zhang, Chao, Xu, Yongbing, Zhang, Rong, Shi, Yi, Wang, Fengqiu
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Comparative studies
Electron energy
Thin films
Time constant
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Summary:The hot-carrier relaxation dynamics of Cd3As2 thin films has been investigated by using femtosecond pump-probe spectroscopy in a transmission geometry. A comparative study of degenerate and non-degenerate experiments reveals that hot-carrier distribution in Cd3As2 is established with a time constant of ∼400 fs. Significantly, the broadband measurements allow the extraction of the time evolution of electron temperature and the carrier-phonon coupling factor g = 5.3 × 1015 W m−3 K−1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd3As2.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4985688