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, Grueninger M, Nagaosa N, Parmigiani F, Fausti D (2014)

Publication Type: Journal article

Publication year: 2014

Journal

Nature Communications Nature Publishing Group: Nature Communications

Book Volume: 5

Article Number: 5112

DOI: 10.1038/ncomms6112

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.

Authors with CRIS profile

Daniele Fausti

Involved external institutions

Università degli Studi di Trieste IT Italy (IT) Università degli Studi di Napoli Federico II IT Italy (IT) Universität zu Köln DE Germany (DE) Elettra Sincrotrone Trieste S.C.p.A. IT Italy (IT) Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy IT Italy (IT) Catholic University of the Sacred Heart / Università Cattolica del Sacro Cuore IT Italy (IT) University of Oxford GB United Kingdom (GB) Institute Of Photonic Sciences / Instituto de Ciencias Fotónicas / Institut de Ciències Fotòniques (ICFO-CERCA) ES Spain (ES) Politecnico di Milano IT Italy (IT) Riken Institute of Physical and Chemical Research / 理化学研究所 JP Japan (JP) University of Tokyo JP Japan (JP)

How to cite

APA:

Novelli, F., De Filippis, G., Cataudella, V., Esposito, M., Vergara, I., Cilento, F.,... Fausti, D. (2014). Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system. Nature Communications, 5. https://doi.org/10.1038/ncomms6112

MLA:

Novelli, Fabio, et al. "Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system." Nature Communications 5 (2014).

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