Anomalous two-photon generation of excitons in CuCl pellets

초록

We report on an anomalous excitation of excitonic matter in pressed CuCl pellets. In these random materials, we find that excitons are initially created for an excitation energy in the range of 1892-2843 meV, which is far below the bandgap of this semiconductor. The excitation-power dependence from the population dynamics of excitonic matter strongly indicates an unusual two-photon generation of ground-state excitons. Considering this off-resonance effect, excitons are probably generated from a continuum of impurity-induced levels excited by two-photon pumping. (c) 2008 American Institute of Physics.

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