Donor Centers in a Gaussian Potential

Abstract

We study a neutral donor center (D0) and a negatively charged donorcenter (D−) trapped by a quantum dot, which is subjected to a Gaussianpotential confinement. Calculations are made by using the method ofnumerical diagonalization of Hamiltonian within the effective-massapproximation. The dependence of the ground state of the neutral shallowdonor and the negatively charged donor on the dot size and the potentialdepth is investigated. The same calculations performed with the parabolicapproximation of the Gaussian potential lead to the results that arequalitatively and quantitatively different from each other.