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.
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., Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system, <<NATURE COMMUNICATIONS>>, 2014; 5 (N/A): N/A-N/A. [doi:10.1038/ncomms6112] [http://hdl.handle.net/10807/60034]
Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system
Giannetti, Claudio;
2014
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.
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