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.

–

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