Enhanced coherent phonon excitation in Fe3GeTe2 via resonance Raman effect

Jia Guo, Chenhui Zhang, Weizheng Liang, Xi-Xiang Zhang, and S. N. Luo
Phys. Rev. B 103, 024302 – Published 21 January 2021

Abstract

Coherent phonon excitation via femtosecond laser pulses can be used to control physical properties of matter, and enhancing coherent phonon excitation is highly relevant. Here, we report the strong enhancement of coherent phonon excitation in Fe3GeTe2 (FGT) via the resonance Raman effect. On the basis of the femtosecond transient optical spectroscopy measurements, the A1g coherent phonon excitation in FGT is obtained as a function of pump photon energy. Its excitation can be maximized by tuning the pump photon energy. The maximum coherent phonon excitation at the 1.574-eV pump photon energy corresponds to an electronic transition in FGT, and is a direct result of the resonance Raman effect. The A1g coherent phonon generation follows the impulsive stimulated Raman scattering mechanism. Our work demonstrates that the resonance Raman effect can be an effective way to enhance coherent phonon excitation via electronic excitation.

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  • Received 18 September 2020
  • Revised 27 October 2020
  • Accepted 7 January 2021

DOI:https://doi.org/10.1103/PhysRevB.103.024302

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jia Guo1,*, Chenhui Zhang2,*, Weizheng Liang1,†, Xi-Xiang Zhang2, and S. N. Luo3,‡

  • 1The Peac Institute of Multiscale Sciences, Chengdu, Sichuan, People's Republic of China
  • 2Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
  • 3School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, People's Republic of China

  • *These authors contributed equally to this work.
  • wzliang@pims.ac.cn
  • sluo@swjtu.edu.cn

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Vol. 103, Iss. 2 — 1 January 2021

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