Abstract

Charge-tunable quantum dots (QDs) are attractive not only for potential application to quantum information devices using electronic spins, but also for studying the electronic shell structures in man-made “artificial atoms”. Recently, many groups reported photoluminescence (PL) measurements from single charge-tunable QDs. But most of the experiments were conducted at wavelength below 1 μm.^1,2 In this study, we investigated the optical characteristics of single charge-tunable InAs QDs emitting at 1.2 μm, whose size is about twice those discussed in the previous reports. For probing electronic shell structures, large QDs are favorable in terms of deep confinement potentials and weak Coulomb interaction.

© 2007 IEEE