Many-body effects in the gain spectra of highly excited quantum-dot lasers- art. no. 115315

Optical gain spectra are computed for quantum dots under high excitation co nditions. where there is a non-negligible two-dimensional carrier density s urrounding the dots. Using a screened Hartree-Fock theory to describe the i nfluence of the Coulomb interaction, we find different self-energy shifts f or the dot and quantum-well transitions. Furthermore. in contrast to the re sult for quantum-well and bulk systems. the peak gain at the quantum-dot tr ansition computed including Coulomb effects is reduced from its free carrie r value.