Many-body recombination in photoexcited insulating cuprates

Many-body recombination in photoexcited insulating cuprates

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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 read more 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 here photon energy and peaks at nearly twice the charge-transfer energy, suggesting that the variation is caused by copyright multiplication through impact ionization.