The exciton states in a CdTe quantum ring subjected to an external magnetic field
containing a single magnetic impurity are investigated. We have used the multiband
approximation which includes the heavy hole–light hole coupling effects. The electron–hole
spin interactions and the s, p–d interactions between the electron, the hole and the magnetic
impurity are also included. The exciton energy levels and optical transitions are evaluated
using the exact diagonalization scheme. We show that due to the spin interactions it is …