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

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

2009-03-10

arxiv.org/abs/0903.1715v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

We present a theory of ultrafast photo-induced dynamics in a spin-charge coupled system, motivated by pump-probe experiments in perovskite manganites. A microscopic picture for multiple dynamics in spin and charge degrees is focused on. Real-time simulations are carried out by two complimentary methods. Our calculation demonstrates that electron motion governs a short-time scale where charge and spin dynamics are combined strongly, while, in a long-time scale controlled by spin relaxation, charge sector does not follow remarkable change in spin sector. Present results are in contrast to a conventional double-exchange picture in equilibrium states.

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