Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide

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2016
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Yang, Ding-Shyue
Zewail, Ahmed H.
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European Union (EU): 647771
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Direct Visualization of Light-Driven Atomic-Scale Carrier Dynamics in Space and Time DIVI
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Structural dynamics. 2016, 3(3), pp. 034304. eISSN 2329-7778. Available under: doi: 10.1063/1.4953370
Zusammenfassung

Time-resolved electron diffraction with atomic-scale spatial and temporal resolution was used to unravel the transformation pathway in the photoinduced structural phase transition of vanadium dioxide. Results from bulk crystals and single-crystalline thin-films reveal a common, stepwise mechanism: First, there is a femtosecond V-V bond dilation within 300 fs, second, an intracell adjustment in picoseconds and, third, a nanoscale shear motion within tens of picoseconds. Experiments at different ambient temperatures and pump laser fluences reveal a temperature-dependent excitation threshold required to trigger the transitional reaction path of the atomic motions.

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ISO 690YANG, Ding-Shyue, Peter BAUM, Ahmed H. ZEWAIL, 2016. Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide. In: Structural dynamics. 2016, 3(3), pp. 034304. eISSN 2329-7778. Available under: doi: 10.1063/1.4953370
BibTex
@article{Yang2016-05Ultra-43257,
  year={2016},
  doi={10.1063/1.4953370},
  title={Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide},
  number={3},
  volume={3},
  journal={Structural dynamics},
  author={Yang, Ding-Shyue and Baum, Peter and Zewail, Ahmed H.}
}
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