Elettra-Sincrotrone Trieste S.C.p.A. website uses session cookies which are required for users to navigate appropriately and safely. Session cookies created by the Elettra-Sincrotrone Trieste S.C.p.A. website navigation do not affect users' privacy during their browsing experience on our website, as they do not entail processing their personal identification data. Session cookies are not permanently stored and indeed are cancelled when the connection to the Elettra-Sincrotrone Trieste S.C.p.A. website is terminated.
More info

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)

Ultima modifica il Martedì, 24 Novembre 2015 18:46