Anisotropic phonon dynamics in Dirac semimetal PtTe<sub>2</sub> thin films enabled by helicity-dependent ultrafast light excitation

Ziyang Li; Yequan Chen; Anke Song; Jinzhong Zhang; Rong Zhang; Zongzhi Zhang; Xuefeng Wang

doi:10.1038/s41377-024-01540-z

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Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation

Original Articles

- Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation
- Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation
- LSA 2024年13卷第9期页码：1888-1897
- Affiliations：
  
  1.Key Laboratory of Micro and Nano Photonic Structures (MOE), School of Information Science and Technology, Fudan University, Shanghai, China
  2.Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, State Key Laboratory of Spintronics Devices and Technologies, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
  3.Department of Physics, School of Physics and Electronic Science, East China Normal University, Shanghai, China
  4.Department of Physics, Xiamen University, Xiamen, China
- Author bio：
  
  Zongzhi Zhang (zzzhang@fudan.edu.cn)
  Xuefeng Wang (xfwang@nju.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01540-z
  中图分类号：
- 收稿日期：2024-03-02，
  
  修回日期：2024-07-04，
  
  录用日期：2024-07-17，
  
  网络出版日期：2024-08-01，
  
  纸质出版日期：2024-09-30
- Accepted：
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Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation[J]. LSA, 2024,13(9):1888-1897.

Li, Z. Y. et al. Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation. Light: Science & Applications, 13, 1888-1897 (2024).
Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation[J]. LSA, 2024,13(9):1888-1897. DOI： 10.1038/s41377-024-01540-z.

Li, Z. Y. et al. Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation. Light: Science & Applications, 13, 1888-1897 (2024). DOI： 10.1038/s41377-024-01540-z.

摘要

Abstract

Coherent phonons have aroused considerable attention in condensed matter physics owing to their extraordinary capacity of reflecting and controlling the physical properties of matter. However

the investigation on the interaction between coherent phonons and other microscopic particles on the ultrafast timescale within topological systems continues to be an active and unresolved area. Here

we sho

w the energy transfer of coherent optical phonons (COP) in Dirac semimetal PtTe

thin films using ultrafast optical pump-probe spectroscopy. Specifically

the helicity-dependent light-driven anisotropic COP signals disclose their direct connection with the light-excited anisotropic spin-polarized electrons via an angular momentum transfer. Furthermore

we observe the notable decreases in the COP oscillation frequency and the decay rate with increasing temperatures due to the anharmonic phonon-phonon scattering and electron-phonon scattering in the COP dissipation process

respectively. Our work paves the way for uncovering the coherent phonons in Dirac semimetals for the potential applications in optoelectronics and opto-spintronics.

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references

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Anisotropic phonon dynamics in Dirac semimetal PtTe2 thin films enabled by helicity-dependent ultrafast light excitation

Anisotropic phonon dynamics in Dirac semimetal PtTe2 thin films enabled by helicity-dependent ultrafast light excitation

DOI：10.1038/s41377-024-01540-z

摘要

Abstract

关键词

Keywords

references

Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation

Anisotropic phonon dynamics in Dirac semimetal PtTe₂ thin films enabled by helicity-dependent ultrafast light excitation