When the plasma frequency coincides with the band gap in a narrow-gap semiconductor like (Pb_1-xSnₓ)Se, the electron-hole recombination is quite fast, in the picosecond range. Plasmon lifetime is calculated and taken into account in the calculation of the recombination rate. Experiments in which the plasmon-assisted recombination may be observed directly are proposed.
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Ahmet Elçi (1977) studied this question.
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