  We present a theory for the electronic and magneto-optical properties of
spherical quantum dots consisting of an inner core surrounded by an outer
shell. This core-shell quantum dot is doped by magnetic Mn impurities all of
which are implanted at a preselected radius on a spherical surface within the
dot. The spherical symmetry of the dot is broken by the application of an
external magnetic field. The electronic states in the presence of a magnetic
field are treated in an effective mass model which includes the s-d and p-d
exchange interaction with localized Mn d electrons. The strain in the quantum
dot due to lattice mismatch between core and shell regions is assumed to be
pseudomorphic and the effect of this strain field on the electronic states is
also included. The optical properties of the quantum dot are computed using the
effective mass electronic states and Fermi's golden rule.
