Details

Autor(en) / Beteiligte

• Yang, Ding-Shyue
• Baum, Peter
• Zewail, Ahmed H.

Titel

Ultrafast electron crystallography of the cooperative reaction path in vanadium dioxide

Ist Teil von

• Structural dynamics (Melville, N.Y.), 2016-05, Vol.3 (3), p.034304-034304

Ort / Verlag

United States: American Institute of Physics, Inc

Erscheinungsjahr

2016

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• 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.