%0 Unpublished work
%T Ultrafast filling of an electronic pseudogap in photoexcited (LaS) 1.196 VS 2
%+ Laboratoire de Physique des Solides (LPS)
%+ Laboratoire d'optique appliquée (LOA)
%+ CASSIOPEE
%+ Institut des Matériaux Jean Rouxel (IMN)
%+ GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347)
%+ Laboratoire des Solides Irradiés (LSI)
%A Brouet, V
%A Mauchain, Julien
%A Papalazarou, E
%A Faure, Jérôme
%A Marsi, M
%A Taleb-Ibrahimi, A
%A Le Fèvre, P
%A Bertran, F
%A Cario, Laurent
%A Janod, Etienne
%A Corraze, Benoît
%A Ta Phuoc, V
%A Perfetti, L
%8 2015-06-02
%D 2015
%Z Physics [physics]
%Z Physics [physics]/Condensed Matter [cond-mat]Preprints, Working Papers, ...
%X We investigate by angle and time resolved photoemission spectroscopy the unusual insulating state of strongly distorted triangular V slabs in (LaS)1.196VS2. We show that the electronic structure is dominated by the lowest band of the V t2g manifold, which disperses over 0.7 eV and is nearly filled. Hence, (LaS)1.196VS2 is not a Mott insulator. The spectra are strongly temperature dependent, shifting by 100 meV upon cooling to 50 K. The sudden photoexcitation at 50K induces a partial filling of the electronic pseudogap within less than 80 fs. The electronic energy flows into the lattice modes on a comparable timescale. We conclude that a very strong electron-phonon coupling makes this state extremely sensitive to small perturbations of the V clusters distortions.
%G English
%2 https://hal-ensta-paris.archives-ouvertes.fr/hal-01159053/document
%2 https://hal-ensta-paris.archives-ouvertes.fr/hal-01159053/file/LaVS3_v7_LC.pdf
%L hal-01159053
%U https://hal-ensta-paris.archives-ouvertes.fr/hal-01159053
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