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Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material

G. Lantz 1, 2, * B. Mansart 1 D. Grieger 3 Davide Boschetto 4 N. Nilforoushan, 1 E. Papalazarou 1 N. Moisan, 1 L Perfetti 5 V. Jacques 1 D. Le Bolloc'H 1 C. Laulhé 6 S. Ravy 1, 6 J.-P. Rueff 6, 7 T. E. Glover, 8 M.P. Hertlein, 8 Z. Hussain, 8 S. Song, 9 M Chollet 9 M. Fabrizio, 3 M. Marsi, 1
* Corresponding author
1 LPS - Laboratoire de Physique des Solides
2 Institute for Quantum Electronics
3 SISSA / ISAS - Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies
4 LOA - Laboratoire d'optique appliquée
5 LSI - Laboratoire des Solides Irradiés
6 SSOLEIL - Synchrotron SOLEIL
7 LCPMR - Laboratoire de Chimie Physique - Matière et Rayonnement
8 ALS - Advanced Light Source [LBNL Berkeley]
9 LCLS - Linac Coherent Light Source
Abstract : The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behaviour. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states inaccessible by quasi-adiabatic pathways. Here we show that the prototype Mott-Hubbard material V$_2$O$_3$ presents a transient non-thermal phase developing immediately after ultrafast photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a$_{1g}$ orbital, and is then stabilized by a lattice distortion characterized by a hardening of the A$_{1g}$ coherent phonon, in stark contrast with the softening observed upon heating. Our results show the importance of selective electron-lattice interplay for the ultrafast control of material parameters, and are relevant for the optical manipulation of strongly correlated systems.
Keywords : CR-DOPED V2O3 TRANSITION TIME VIBRATIONS STATE SPIN VO2
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G. Lantz, B. Mansart, D. Grieger, Davide Boschetto, N. Nilforoushan,, et al.. Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material. Nature Communications, Nature Publishing Group, 2017, 8, pp.13917. ⟨10.1038/ncomms13917⟩. ⟨hal-01467747⟩

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