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

Fabio Novelli, Giulio De Filippis (), Vittorio Cataudella, Martina Esposito, Ignacio Vergara, Federico Cilento, Enrico Sindici, Adriano Amaricci, Claudio Giannetti, Dharmalingam Prabhakaran, Simon Wall, Andrea Perucchi, Stefano Dal Conte, Giulio Cerullo, Massimo Capone, Andrey Mishchenko, Markus Grüninger, Naoto Nagaosa, Fulvio Parmigiani and Daniele Fausti ()
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Fabio Novelli: Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
Giulio De Filippis: Università di Napoli Federico II
Vittorio Cataudella: Università di Napoli Federico II
Martina Esposito: Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
Ignacio Vergara: II. Physikalisches Institut, Universität zu Köln
Federico Cilento: Elettra—Sincrotrone Trieste S.C.p.A.
Enrico Sindici: Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
Adriano Amaricci: CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Claudio Giannetti: I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore
Dharmalingam Prabhakaran: University of Oxford
Simon Wall: ICFO-Institut de Ciencies Fotoniques
Andrea Perucchi: Elettra—Sincrotrone Trieste S.C.p.A.
Stefano Dal Conte: IFN-CNR, Politecnico di Milano
Giulio Cerullo: IFN-CNR, Politecnico di Milano
Massimo Capone: CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Andrey Mishchenko: RIKEN Center for Emergent Matter Science (CEMS)
Markus Grüninger: II. Physikalisches Institut, Universität zu Köln
Naoto Nagaosa: RIKEN Center for Emergent Matter Science (CEMS)
Fulvio Parmigiani: Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
Daniele Fausti: Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6112

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