We report the first experimental evidence for the existence of free polyexcitons ($n>2$) in a semiconductor. Resolved polyexciton lines, together with the biexciton line, were observed in the green photo-luminescence spectrum of ultrahigh-purity silicon. We propose that the unresolved luminescence of these polyexcitons in the "ordinary" near-infrared photoluminescence process may provide an alternative explanation for a band interpreted by others to be due to a new condensed phase of the electron-hole plasma.
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Steele et al. (1987) studied this question.
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