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

Authors

Chunhui Zhu, Nanjing University
Xiang Yuan, Fudan University
Faxian Xiu, Fudan University
C Zhang, University of WollongongFollow
Yongbing Xu, Nanjing University
Rong Zhang, Nanjing University
Yi Shi, Nanjing University
Fengqiu Wang, Nanjing UniversityFollow

RIS ID

116248

Publication Details

Zhu, C., Yuan, X., Xiu, F., Zhang, C., Xu, Y., Zhang, R., Shi, Y. & Wang, F. (2017). Broadband hot-carrier dynamics in three-dimensional Dirac semimetal Cd3As2. Applied Physics Letters, 111 (9), 091101-1-091101-4.

Abstract

The hot-carrier relaxation dynamics of Cd 3 As 2 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 Cd 3 As 2 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 x 10 15 W m -3 K -1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd 3 As 2 .

Grant Number

ARC/DP160101474