BINDING ENERGY OF ACCEPTORS IN SEMIMAGNETIC QUANTUM DOTS

The binding energies of shallow acceptors in Cd1-xin Mn-xin Te/Cd1-xout Mn-xout Te quantum dots are calculated in the presence of external magnetic fields. Variational calculations are performed within effective mass approximation. The results show that the impurity binding energy (i) increases with the reduction in dot sizes, (ii) decreases with the magnetic field is increased for a given dot, and (iii) reaches a peak value as the dot radius decreases and then diminishes to a limiting value corresponding to the radius for which there are no bound states in the quantum dot. Spin polaronic shifts are estimated with the acceptor envelope function using a mean field theory. These results are compared with the existing literatures.