EFFECTS OF CONFINEMENT POTENTIAL ON FEW-ELECTRON QUANTUM DOTS IN MAGNETIC FIELD

Abstract

Effects of confinement potential hω0 on two- and four-electron quantum dots (QDs) subjected to an external magnetic field B are theoretically investigated. The energy spectra of low-lying states of the QDs as a function of B are obtained. The (L0, S0) phase diagrams are presented, indicating how the ground-state transitions of the QDs vary with B and hω0, where L0 denotes the total angular momentum and S0 the total spin of the ground states. Arising from symmetry effect, L0 and S0 are matched with each other in a special way. Density functions are calculated, and information on electronic configurations is extracted from them. The ground states are found to have a regular-polygon configuration.