Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe<sub>4</sub> under ultrafast photoexcitation

Xiao Zhuo; Jiawei Lai; Peng Yu; Ze Yu; Junchao Ma; Wei Lu; Miao Liu; Zheng Liu; Dong Sun

doi:10.1038/s41377-021-00546-1

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Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe₄ under ultrafast photoexcitation

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- Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe₄ under ultrafast photoexcitation
- Light: Science & Applications Vol. 10, Issue 6, Pages: 1053-1060(2021)
- Affiliations：
  
  1.International Center for Quantum Materials, School of Physics, Peking University, 100871 Beijing, China
  2.State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, 510275 Guangzhou, Guangdong, China
  3.Centre for Programmed Materials, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
  4.Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
  5.State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, No. 92 Weijin Road, 300072 Tianjin, China
  6.Songshan Lake Materials Laboratory, 523808 Dongguan, Guangdong, China
  7.Collaborative Innovation Center of Quantum Matter, 100871 Beijing, China
- Author bio：
  
  Dong Sun (sundong@pku.edu.cn)
- Funds：
- DOI：10.1038/s41377-021-00546-1
  CLC：
- Published：30 June 2021，
  
  Published Online：14 May 2021，
  
  Received：19 February 2021，
  
  Revised：22 April 2021，
  
  Accepted：23 April 2021
- Accepted：
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Zhuo, X. et al. Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe₄ under ultrafast photoexcitation. Light: Science & Applications, 10, 1053-1060 (2021).
DOI：

Zhuo, X. et al. Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe₄ under ultrafast photoexcitation. Light: Science & Applications, 10, 1053-1060 (2021). DOI： 10.1038/s41377-021-00546-1.

摘要

Abstract

Layered type-Ⅱ Weyl semimetals

such as WTe

MoTe

and TaIrTe

have been demonstrated as a supreme photodetection material with topologically enhanced responsivity and specific sensitivity to the orbital angular momentum of light. Toward future device applications with high performance and ultrafast response

it is necessary to understand the dynamical processes of hot carriers and transient electronic properties of these materials under photoexcitation. In this work

mid-infrared ultrafast spectroscopy is performed to study the dynamical evolution of the anisotropic response of TaIrTe

. The dynamical relaxation of photoexcited carriers exhibits three exponential decay components relating to optical/acoustic phonon cooling and subsequent heat transfer to the substrate. The ultrafast transient dynamics imply that TaIrTe

is an ideal material candidate for ultrafast optoelectronic applications

especially in the long-wavelength region. The angle-resolved measurement of transient reflection reveals that the reflectivity becomes less anisotropic in the quasi-equilibrium state

indicating a reduc

tion in the anisotropy of dynamical conductivity in presence of photoexcited hot carriers. The results are indispensable in material engineering for polarization-sensitive optoelectronics and high field electronics.

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Keywords

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Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe4 under ultrafast photoexcitation

DOI：10.1038/s41377-021-00546-1

摘要

Abstract

关键词

Keywords

references

Dynamical evolution of anisotropic response of type-Ⅱ Weyl semimetal TaIrTe₄ under ultrafast photoexcitation