Jla. Chilla et al., ORIGIN OF PHOTOLUMINESCENCE SIGNALS OBTAINED BY PICOSECOND-EXCITATIONCORRELATION-MEASUREMENTS, Physical review. B, Condensed matter, 48(19), 1993, pp. 14347-14355
We have developed a theory that explains the spectral distribution and
the different time decay behaviors of the signals observed in picosec
ond excitation-correlation measurements of semiconductor materials. Th
e results display good quantitative agreement with experiments on mult
iple quantum wells and show that band filling has an important role in
determining the characteristics of the correlation signals. Two limit
cases are found and mathematically characterized: the non-degenerate
regime, where the signals are positive with exponential-like decays, a
nd the degenerate regime, where band filling gives rise to negative si
gnals. It is shown that the technique is a sensitive probe of the carr
ier dynamics not fully exploited in previous work.