A spin-density-functional study of quantum dots and rings
Journal
Journal of Magnetism and Magnetic Materials
Journal Volume
239
Journal Issue
1-3
Pages
240-242
Date Issued
2002
Author(s)
Abstract
We present a spin-density-functional theoretical (SDFT) study of the electronic states in GaAs quantum dots embedded in AlGaAs substrates. The SDFT allows for a systematic study of the joint effects of confinement, Coulomb interactions and spin for realistic systems. We model the system as electrons confined in a finite cylindrical dot. The screening due to the gate electrodes is also taken into account. The method predicts the electron addition energy spectra that are in agreement with experiments. We also apply the SDFT to GaAs quantum rings and find that they too show shell structures in the additional energy spectra. © 2002 Elsevier Science B.V. All rights reserved.
Subjects
Addition energy; Mesoscopic physics; Quantum dots; Quantum rings
SDGs
Other Subjects
Electrodes; Electronic density of states; Gates (transistor); Probability density function; Semiconducting gallium arsenide; Spectrum analysis; Quantum rings; Semiconductor quantum dots
Type
journal article