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 proceedings. They include the speaker's narration with video of the slides and animations. Most include full-text papers. Interactive, searchable transcripts and closed captioning are now available for 2018 presentations, with transcripts for prior recordings added daily.
Search our growing collection of more than 16,000 conference presentations, including many plenaries and keynotes.