Low-energy exciton states in a nanoscopic semiconducting ring - art. no. 045320

We consider an effective mass model for an electron-hole pair in a simplifi ed confinement potential, which is applicable to both a nanoscopic self-ass embled semiconducting InAs ring and a quantum dot. The linear optical susce ptibility, proportional to the absorption intensity of near-infrared transm ission, is calculated as a function of the ring radius R-0. Compared with t he properties of the quantum dot corresponding to the model with a very sma ll radius R-0, our results are in qualitative agreement with the recent exp erimental measurements by Pettersson et al.