Physical Review Research (Dec 2019)

Many-body recombination in photoexcited insulating cuprates

  • Derek G. Sahota,
  • Ruixing Liang,
  • M. Dion,
  • Patrick Fournier,
  • Hanna A. Dąbkowska,
  • Graeme M. Luke,
  • J. Steven Dodge

DOI
https://doi.org/10.1103/PhysRevResearch.1.033214
Journal volume & issue
Vol. 1, no. 3
p. 033214

Abstract

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We study the pump-probe response of three insulating cuprates and develop a model for its recombination kinetics. The dependence on time, fluence, and both pump and probe photon energies implies many-body recombination on femtosecond timescales, characterized by anomalously large trapping and Auger coefficients. The fluence dependence follows a universal form that includes a characteristic volume scale, which we associate with the holon-doublon excitation efficiency. This volume varies strongly with pump photon energy and peaks at nearly twice the charge-transfer energy, suggesting that the variation is caused by carrier multiplication through impact ionization.