Excitonic enhancement of the Fermi-edge singularity in the optical spectra of doped semiconductors

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Abstract
Low-temperature optical-absorption and -emission spectra are calculated for n-type doped semiconductors in which the Fermi level is nearly degenerate with the exciton of a higher conduction band. It is shown that in such a system the Fermi-edge singularity can be strongly enhanced by the hybridization with the excitonic resonance. In fact, due to this enhancement the Fermi-edge singularity, which is usually only observed in absorption, also becomes visible in the emission spectrum, in accordance with recent experimental findings.
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