Energy Spectra of Donors in Spherical Quantum Dots with Parabolic Confinement
Abstract
The binding energy of a hydrogenic donor in a spherical GaAsGa_{1 x }Al_{ x }As quantum dot with parabolic confinement is calculated by taking into account the finite value of the barrier potential. Using the effectivemass approximation, we obtained the energy of the ground state as a function of the dot size for different impurity positions. The results show that the effect of the finite value of the barrier potential is to lower the energies of the states. The differences between the proper solutions and the infinite barrier potential approximation increase noticeably, especially for oncenter impurity and for small dot radii. We have also shown that the impurity binding energy is much dependent upon the impurity position in the system. This fact is important for a correct description of impurityrelated absorption and photoluminescence experiments.
 Publication:

Czechoslovak Journal of Physics
 Pub Date:
 November 2001
 DOI:
 10.1023/A:1012867013167
 Bibcode:
 2001CzJPh..51.1205N
 Keywords:

 quantum dot  hydrogenic donor  impurityposition effect