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We predict a new physical mechanism explaining the electron spin precessionfrequency focusing effect observed recently in singly charged quantum dotsexposed to a periodic train of resonant circularly polarized short opticalpulses [A. Greilich et al, Science 317, 1896 (2007), Ref. 1]. We show thatelectron spin precession in an external magnetic field and a field of nucleicreates a Knight field oscillating at the frequency of nuclear spin resonance.This field drives the projection of the nuclear spin onto magnetic field to thevalue that makes the electron spin precession frequency a multiple of the traincyclic repetition frequency, which is the condition at which the Knight fieldvanishes.

Electron spin synchronization induced by optical nuclear magnetic resonance feedback