Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system

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 o...

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Published in:Nature communications 2014-10, Vol.5 (1), p.5112-5112, Article 5112
Main Authors: Novelli, Fabio, De Filippis, Giulio, Cataudella, Vittorio, Esposito, Martina, Vergara, Ignacio, Cilento, Federico, Sindici, Enrico, Amaricci, Adriano, Giannetti, Claudio, Prabhakaran, Dharmalingam, Wall, Simon, Perucchi, Andrea, Dal Conte, Stefano, Cerullo, Giulio, Capone, Massimo, Mishchenko, Andrey, Grüninger, Markus, Nagaosa, Naoto, Parmigiani, Fulvio, Fausti, Daniele
Format: Article
Language:English
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Summary: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 (La2CuO(4+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.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms6112