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
Zongzhi Zhang (zzzhang@fudan.edu.cn)
Xuefeng Wang (xfwang@nju.edu.cn)
Published:30 September 2024,
Published Online:01 August 2024,
Received:02 March 2024,
Revised:04 July 2024,
Accepted:17 July 2024
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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).
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.
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
2
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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