Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2017

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

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Davide Boschetto
C. Laulhé
  • Function : Author
S. Ravy
  • Function : Author
  • PersonId : 1176434
  • IdHAL : sravy

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.
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Dates and versions

hal-01467747 , version 1 (23-05-2019)

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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, 2017, 8, pp.13917. ⟨10.1038/ncomms13917⟩. ⟨hal-01467747⟩
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