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Proceedings Paper

Coherent phonon dynamics in misfit-layered chalcogenide LaVS3 crystal
Author(s): M. Lejman; G. Galle; J. Faure; L. Cario; D. Boschetto
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Paper 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.

Paper Details

Date Published: 5 March 2018
PDF: 6 pages
Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300N (5 March 2018); doi: 10.1117/12.2287357
Show Author Affiliations
M. Lejman, LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique (France)
G. Galle, LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique (France)
J. Faure, LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique (France)
L. Cario, Institut des Materiaux Jean Rouxel, CNRS, Univ. de Nantes (France)
D. Boschetto, LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique (France)

Published in SPIE Proceedings Vol. 10530:
Ultrafast Phenomena and Nanophotonics XXII
Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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