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We present a spin-boson theory for magnetotransport in organic semiconductingmaterials, on the basis of a coupling between charge carriers' spin and a localbosonic environment, which is shown to be an irreducible ingredient inunderstanding of the anomalous organic magnetoresistance (OMR). Among thosecomposing this environment triplet-excitons play a basic role. The incoherenthopping rate between molecules is calculated to give out the fundamentalbehavior of OMR. The underlying mechanism is revealed from the calculation ofentanglement, represented by the von Neumann entropy, between the carrier'sspin and bosons. We also obtain the dependence of OMR on the bias voltage, thespin-boson coupling, and the boson frequency. The results obtained from thetheory are in good agreement with experiments.

Spin-Boson Theory for Magnetotransport in Organic Semiconducting Materials