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+δ), 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 / 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., Grüninger, M., Nagaosa, N., Parmigiani, F., Fausti, D.. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - ELETTRONICO. - 5:(2014), pp. 5112.5112-5112."-". [10.1038/ncomms6112]
Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system
NOVELLI, FABIO;ESPOSITO, MARTINA;CILENTO, FEDERICO;SINDICI, ENRICO;DAL CONTE, STEFANO;PARMIGIANI, FULVIO;FAUSTI, DANIELE
2014-01-01
Abstract
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+δ), 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.Pubblicazioni consigliate
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