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+delta), 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. © 2014 Macmillan Publishers Limited. All rights reserved.
|Titolo:||Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system|
|Autori:||Novelli, F; De Filippis, G; Cataudella, V; Esposito, M; Vergara, I; Cilento, F; Sindici, E; Amaricci, A; Giannetti, C; Prabhakaran, D; Wall, S; Perucchi, A; Dal Conte, S; Cerullo, G; Capone, M; Mishchenko, A; Gruninger, M; Nagaosa, N; Parmigiani, F; Fausti, D|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||10.1038/ncomms6112|
|Fulltext via DOI:||10.1038/ncomms6112|
|Appare nelle tipologie:||1.1 Journal article|