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 A1g phonon mode. The time scale of this coupling is around 140 fs, whereas the time-scale of the interaction between the A1g 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.
M. Lejman, G. Galle, J. Faure, L. Cario, and D. Boschetto, "Coherent phonon dynamics in misfit-layered chalcogenide LaVS3 crystal," Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300N (Presented at SPIE OPTO: January 30, 2018; Published: 5 March 2018); https://doi.org/10.1117/12.2287357.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.