Photoinduced gap renormalization and many-body recombination in insulating cuprates

ORAL

Abstract

We have studied the pump-probe response of three insulating cuprates as a function of both pump and probe photon energies, time, and fluence. The fluence dependence follows a simple and universal analytical form that includes a characteristic volume scale, which we associate with the interaction volume for a photoexcitation. This characteristic size varies strongly with pump photon energy, with a maximum just above the charge-transfer absorption peak. We also show evidence for ultrafast many-body recombination in the photocarrier kinetics, characterized by an anomalously large Auger coefficient.

*PF, GL, and JSD acknowledge support from NSERC and CIFAR, PF from the Canada First Research Excellence Fund, and DGS from an NSERC Alexander Graham Bell Canada Graduate Scholarship.

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Presenters

  • J. Steven Dodge

    • Department of Physics, Simon Fraser University

Authors

  • J. Steven Dodge

    • Department of Physics, Simon Fraser University

  • Derek Sahota

    • Department of Physics, Simon Fraser University

  • Ruixing Liang

    • University of British Columbia
    • Department of Physics and Astronomy, University of British Columbia

  • Maxime Dion

    • Départment de Physique, Université de Sherbrooke

  • Patrick Fournier

    • Départment de Physique, Université de Sherbrooke

  • Hanna Dabkowska

    • McMaster Univ
    • Department of Physics and Astronomy, McMaster Univ
    • Brockhouse Institute for Materials Research, McMaster University
    • Brockhouse Institute for Materials Research
    • McMaster University

  • Graeme Luke

    • McMaster University
    • Physics and Astronomy, McMaster University
    • Department of Physics and Astronomy, McMaster Univ
    • Department of Physics and Astronomy, McMaster University
    • Physics and Astronomy, McMaster Univ
    • MacMaster University
    • Physics, McMaster University
    • McMaster Univ