Abstract
We investigate the temperature dependent photoluminescence (PL) spectra of exciton complexes in the self-assembled InAs/GaAs quantum rings (QRs) by using an atomistic pseudopotential method and a configuration-interaction treatment of many-particle effects. We find, unlike in quantum dots, the biexciton XX and positive trion X+ in QRs show multitransition peaks even at very low temperatures, and the PL spectra are very sensitive to the temperature. The peculiar temperature dependent spectra of XX and X+ is due to the unique electronic structures and the strong many-body correlation effects in the QRs.
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