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We analyze the spin dynamics of an individual magnetic atom (Mn) inserted ina II-VI semiconductor quantum dot under resonant optical excitation. Inaddition to standard optical pumping expected for a resonant excitation, weshow that for particular conditions of laser detuning and excitation intensity,the spin population can be trapped in the state which is resonantly excited.This effect is modeled considering the coherent spin dynamics of the coupledelectronic and nuclear spin of the Mn atom optically dressed by a resonantlaser field. This spin population trapping mechanism is controlled by thecombined effect of the coupling with the laser field and the coherentinteraction between the different Mn spin states induced by an anisotropy ofthe strain in the plane of the quantum dot.

Spin dynamics of a Mn atom in a semiconductor quantum dot under resonant optical excitation