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Lejman, M., Galle, G., Faure, J., Cario, L. & Boschetto, D. (2018) Coherent phonon dynamics in misfit-layered chalcogenide LaVS3 crystal. Betz, M. & Elezzabi, A. Y. (Eds.), Ultrafast Phenomena and Nanophotonics Xxii.
Added by: Richard Baschera (2019-01-04 10:38:23) Last edited by: Richard Baschera (2019-01-04 10:46:19) |
| Type de référence: Chapitre/Section Clé BibTeX: Lejman2018 Voir tous les détails bibliographiques  |
Catégories: PMN Créateurs: Betz, Boschetto, Cario, Elezzabi, Faure, Galle, Lejman Collection: Ultrafast {Phenomena} and {Nanophotonics} {Xxii} |
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| Résumé |
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We show time resolved spectroscopy measurements with femtosecond time resolution in LaVS3 crystal. Transient reflectivity reveals the existence of a preferential coupling between the photexcited electrons and the coherently excited A(1g) phonon mode. The time scale of this coupling is around 140 fs, whereas the time-scale of the interaction between the A(1g) phonon mode and the other phonons is around 400 fs. This phonon mode is damped in less then 2 ps. On longer time scale, the transient dynamics is characterized by a long-standing plateau of reflectivity, which can be due to either low inter-plane thermal conductivity or to a metastable state caused by carrier trapping in vanadium cluster.
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