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

Author

Listed:
  • Fabio Novelli

    (Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
    Elettra—Sincrotrone Trieste S.C.p.A.)

  • 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
    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.
    INSTM UdR Trieste-ST, 34149 Basovizza, Italy)

  • 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)
    RRC ‘Kurchatov Institute’)

  • Markus Grüninger

    (II. Physikalisches Institut, Universität zu Köln)

  • Naoto Nagaosa

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • Fulvio Parmigiani

    (Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
    Elettra—Sincrotrone Trieste S.C.p.A.
    II. Physikalisches Institut, Universität zu Köln)

  • Daniele Fausti

    (Università degli Studi di Trieste, Via Valerio 2, 34127 Trieste, Italy
    Elettra—Sincrotrone Trieste S.C.p.A.)

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.

Suggested Citation

  • Fabio Novelli & Giulio De Filippis & Vittorio Cataudella & Martina Esposito & Ignacio Vergara & Federico Cilento & Enrico Sindici & Adriano Amaricci & Claudio Giannetti & Dharmalingam Prabhakaran & Si, 2014. "Witnessing the formation and relaxation of dressed quasi-particles in a strongly correlated electron system," Nature Communications, Nature, vol. 5(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6112
    DOI: 10.1038/ncomms6112
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