Paramagnetism of interacting few-electron quantum dot with single magnetic impurity

We present theoretical results on the effects of particle–particle interaction and single spin-View the MathML source magnetic impurity (Mn2+) on the paramagnetism of interacting spherical quantum dots(QDs). Within the effective mass approximation, the energy spectrum, magnetization, and magnetic susceptibility of the semi-magnetic QDs with electron number Ne=1–4 are calculated by using the configuration interaction method. It is found that the sp–d coupling between carrier and Mn2+ magnetic ion gives rise to suppression or enhancement of paramagnetism, sensitively depending on electron number and the location of ion. The magnetic properties of the dot with Ne=3,4 exhibit pronounced anisotropy due to the anti-symmetry character of the p-shell wave functions coupled to magnetic ion.