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Photoexcitation of Bipolarons in Conducting Polymers

We theoretically study the photoexcitation process in a conducting polymer with a non-degenerate ground state, where the carrier without spin is a bipolaron. The dynamical simulation reveals a photoinduced phenomenon in which a positive bipolaron is split into two polarons by absorbing one photon. The relaxation time of this photoinduced bipolaron split is about 40 fs. It is predicted that this photoinduced phenomenon can be detected experimentally by observing the change of magnetic susceptibility.