Enhanced coherent phonon excitation in Fe3GeTe2 via resonance Raman effect

Jia Guo, Chenhui Zhang, Weizheng Liang, Xixiang Zhang, S. N. Luo

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish (US)
JournalPhysical Review B
Volume103
Issue number2
DOIs
StatePublished - Jan 21 2021

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