Abstract
It is well known that correlations between excitons strongly affect the optical properties of resonantly excited semiconductors.1 Few studies, however, have considered effects of correlations between excitons and unbound electrons or holes when a semiconductor is excited above the band gap.2 In this paper, we report the observation of a surprising correlation-induced resonance (C1R) that appears in differential transmission (DT) spectra of semiconductor quantum wells (QW) excited above the band gap. The properties of this CIR show that it is not due to biexciton formation, but instead may arise from correlations between excitons and unbound electrons or holes.
© 2001 Optical Society of America
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