Simultaneous capturing phonon and electron dynamics in MXenes

Qi Zhang, Jiebo Li (), Jiao Wen, Wei Li, Xin Chen, Yifan Zhang, Jingyong Sun, Xin Yan, Mingjun Hu, Guorong Wu, Kaijun Yuan (), Hongbo Guo () and Xueming Yang
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Qi Zhang: Chinese Academy of Sciences
Jiebo Li: Beihang University
Jiao Wen: Beihang University
Wei Li: GuSu Laboratory of Materials
Xin Chen: GuSu Laboratory of Materials
Yifan Zhang: Beihang University
Jingyong Sun: Beihang University
Xin Yan: Beihang University
Mingjun Hu: Beihang University
Guorong Wu: Chinese Academy of Sciences
Kaijun Yuan: Chinese Academy of Sciences
Hongbo Guo: Beihang University
Xueming Yang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Plasmonic MXenes are of particular interest, because of their unique electron and phonon structures and multiple surface plasmon effects, which are different from traditional plasmonic materials. However, to date, how electronic energy damp to lattice vibrations (phonons) in MXenes has not been unraveled. Here, we employed ultrafast broadband impulsive vibrational spectroscopy to identify the energy damping channels in MXenes (Ti3C2Tx and Mo2CTx). Distinctive from the well-known damping pathways, our results demonstrate a different energy damping channel, in which the Ti3C2Tx plasmonic electron energy transfers to coherent phonons by nonthermal electron mediation after Landau damping, without involving electron-electron scattering. Moreover, electrons are observed to strongly couple with A1g mode (~60 fs, 85–100%) and weakly couple with Eg mode (1–2 ps, 0–15%). Our results provide new insight into the electron-phonon interaction in MXenes, which allows the design of materials enabling efficient manipulation of electron transport and energy conversion.

Date: 2022
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DOI: 10.1038/s41467-022-35605-7

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