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Formation and relaxation of dressed quasi-particles in La2CuO4+d

For Epump > D (e), the dynamics is consistent with a ‘thermal dressing’ scenario; for Epump< (f), the ultrafast drop of kinetic energy goes in pair with the reaction of the bosonic field and a ‘coherent dressing’ mechanism takes place.

The non-equilibrium approach to correlated electron systems is often based on the paradigm that different degrees of freedom interact on different timescales. In this context, photo-excitation is treated as an impulsive injection of electronic energy that is transferred to other degrees of freedom only at later times. Here, by studying the ultrafast dynamics of quasi-particles in an archetypal strongly correlated charge-transfer insulator (La2CuO4+d), we show that the interaction between electrons and bosons manifests itself directly in the photo-excitation processes of a correlated material. With the aid of a general theoretical framework (Hubbard–Holstein Hamiltonian), we reveal that sub-gap excitation pilots the formation of itinerant quasi-particles, which are suddenly dressed by an ultrafast reaction of the bosonic field.

" Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system"
Nature Communications 5, 5112 (2014)

Last Updated on Tuesday, 24 November 2015 18:46