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We present a theory of ultrafast photo-induced dynamics in a spin-chargecoupled system, motivated by pump-probe experiments in perovskite manganites. Amicroscopic picture for multiple dynamics in spin and charge degrees is focusedon. Real-time simulations are carried out by two complimentary methods. Ourcalculation demonstrates that electron motion governs a short-time scale wherecharge and spin dynamics are combined strongly, while, in a long-time scalecontrolled by spin relaxation, charge sector does not follow remarkable changein spin sector. Present results are in contrast to a conventionaldouble-exchange picture in equilibrium states.

Dynamical coupling and separation of multiple degrees of freedom in a photoexcited double-exchange system