C-V Data and Geometry Parameters of Self-Assembled InAs/GaAs Quantum Rings

摘要

The problem of the interpretation of the recent C-V data given in W. Lei, et al. (Appl. Phys. Lett. 96, 033111 (2010)) for InAs/GaAs quantum rings (QR) is considered. We show that the single-electron spectrum calculations, based on a variant of the oscillator model of this paper, do not correspond to the experimentally proposed geometry of QR. We use the QR geometry that is follows from the oscillator model, due to relation between confinement potential parameters of the oscillator model and real sizes of quantum objects, to calculate the electron energy in a magnetic field. The original effective model, based on three-dimensional single band kp-approximation with energy dependence of effective mass, is applied. These calculations give good fit for experimental data.