5 March 2018 Coherent phonon dynamics in misfit-layered chalcogenide LaVS3 crystal
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Abstract
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.
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M. Lejman, G. Galle, J. Faure, L. Cario, D. Boschetto, "Coherent phonon dynamics in misfit-layered chalcogenide LaVS3 crystal", Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300N (5 March 2018); doi: 10.1117/12.2287357; https://doi.org/10.1117/12.2287357
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