ABSTRACT
This chapter presents results of computational studies of the electronic structure of interacting electrons in quantum dots with and without a hydrogenic impurity. The slow variation in the binding energy with the distance from the origin of the dot is expected because of the long-range tail in the potential of the hydrogenic impurity. Imamura et al. has predicted spin-blockade phenomena in single and coupled quantum dots in magnetic fields with a model calculation of the electronic structure based on the exact diagonalization methods. The chapter shows that the impurity breaks the circular symmetry of the quantum dot with significant effects on the electronic structure, spin polarization, and capacitive energy. The strongest effect is obtained for weak confinement at intermediate positions of the impurity where the peaks in the capacitive energy for the completion of the first and the second shell of the original circular parabolic quantum dot have significantly weakened.
