Ground State Transitions of Four-Electron Quantum Dots in Zero Magnetic Field

<Abstract>In this paper,we study four electrons confined in a parabolic quantum dot in the absence of magnetic field,by the exact diagonalization method.The ground-state electronic structures and orbital and spin angular momenta transitions as a function of the confined strength are investigated.We find that the confinement may cause accidental degeneracies between levels with different low-lying states and the inversion of the energy values.The present results are useful to understand the optical properties and internal electron-electron correlations of quantum dot materials.

In this paper, we study four electrons confined in a parabolic quantum dot in the absence of magnetic field, by the exact diagonalization method. The ground-state electronic structures and orbital and spin angular momenta transitions as a function of the confined strength are investigated. We find that the confinement may cause accidental degeneracies between levels with different low-lying states and the inversion of the energy values. The present results are useful to understand the optical properties and internal electron-electron correlations of quantum dot materials.