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Article Dans Une Revue Nature Communications Année : 2021

Strain wave pathway to semiconductor-to-metal transition revealed by time-resolved X-ray powder diffraction

Hervé Cailleau
Eric Collet
Laurent Guérin
Alix Volte
  • Fonction : Auteur
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  • IdHAL : alix-volte
Elzbieta Trzop
R Bertoni
Xu-Dong Che
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  • PersonId : 12159
  • IdHAL : xu-dong
Bruno Lépine
Etienne Janod
Laurent Cario
S. Zerdane

Résumé

One of the main challenges in ultrafast material science is to trigger phase transitions with short pulses of light. Here we show how strain waves, launched by electronic and structural precursor phenomena, determine a coherent macroscopic transformation pathway for the semiconducting-to-metal transition in bistable Ti(3)O(5) nanocrystals. Employing femtosecond powder X-ray diffraction, we measure the lattice deformation in the phase transition as a function of time. We monitor the early intra-cell distortion around the light absorbing metal dimer and the long range deformations governed by acoustic waves propagating from the laser-exposed Ti(3)O(5) surface. We developed a simplified elastic model demonstrating that picosecond switching in nanocrystals happens concomitantly with the propagating acoustic wavefront, several decades faster than thermal processes governed by heat diffusion.
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Dates et versions

hal-03157411 , version 1 (25-05-2021)

Identifiants

Citer

Céline Mariette, Maciej Lorenc, Hervé Cailleau, Eric Collet, Laurent Guérin, et al.. Strain wave pathway to semiconductor-to-metal transition revealed by time-resolved X-ray powder diffraction. Nature Communications, 2021, 12 (1), pp.1239. ⟨10.1038/s41467-021-21316-y⟩. ⟨hal-03157411⟩
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