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

Chunhui Zhu; Xiang Yuan; Faxian Xiu; Chao Zhang; Yongbing Xu; Rong Zhang; Yi Shi; Fengqiu Wang

doi:10.1063/1.4985688

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

Chunhui Zhu
, Xiang Yuan
, Faxian Xiu
, Chao Zhang
, Yongbing Xu
, Rong Zhang
, Yi Shi
, Fengqiu Wang

Nanjing University
Fudan University
University of Wollongong

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

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^-3K^-1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd₃As₂.

Original language	English
Article number	091101
Journal	Applied Physics Letters
Volume	111
Issue number	9
DOIs	https://doi.org/10.1063/1.4985688
State	Published - 28 Aug 2017
Externally published	Yes

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10.1063/1.4985688

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title = "Broadband hot-carrier dynamics in three-dimensional Dirac semimetal Cd3As2",

abstract = "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-3K-1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd3As2.",

author = "Chunhui Zhu and Xiang Yuan and Faxian Xiu and Chao Zhang and Yongbing Xu and Rong Zhang and Yi Shi and Fengqiu Wang",

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T1 - Broadband hot-carrier dynamics in three-dimensional Dirac semimetal Cd3As2

AU - Zhu, Chunhui

AU - Yuan, Xiang

AU - Xiu, Faxian

AU - Zhang, Chao

AU - Xu, Yongbing

AU - Zhang, Rong

AU - Shi, Yi

AU - Wang, Fengqiu

PY - 2017/8/28

Y1 - 2017/8/28

N2 - 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-3K-1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd3As2.

AB - 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-3K-1 is deduced by a semiclassical two-temperature model. These results provide fundamental insights into the hot-carrier dynamics of Cd3As2.

UR - https://www.scopus.com/pages/publications/85028540407

U2 - 10.1063/1.4985688

DO - 10.1063/1.4985688

M3 - 文章

AN - SCOPUS:85028540407

SN - 0003-6951

VL - 111

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 9

M1 - 091101

ER -

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

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