2016年11月
Electron and lattice dynamics of transition metal thin films observed by ultrafast electron diffraction and transient optical measurements
STRUCTURAL DYNAMICS
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- 巻
- 3
- 号
- 6
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.4971210
- 出版者・発行元
- AMER INST PHYSICS
We report the ultrafast dynamics of electrons and lattice in transition metal thin films (Au, Cu, and Mo) investigated by a combination of ultrafast electron diffraction (UED) and pump-probe optical methods. For a single-crystalline Au thin film, we observe the suppression of the diffraction intensity occuring in 10 ps, which direcly reflects the lattice thermalization via the electron-phonon interaction. By using the two-temperature model, the electron-phonon coupling constant (g) and the electron and lattice temperatures (T-e, T-1) are evaluated from UED, with which we simulate the transient optical transmittance. The simulation well agrees with the experimentally obtained transmittance data, except for the slight deviations at the initial photoexcitation and the relaxed quasi-equilibrium state. We also present the results similarly obtained for polycrystalline Au, Cu, and Mo thin films and demonstrate the electron and lattice dynamics occurring in metals with different electron-phonon coupling strengths. (C) 2016 Author(s).
- リンク情報
- ID情報
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- DOI : 10.1063/1.4971210
- ISSN : 2329-7778
- Web of Science ID : WOS:000392117200005