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- W2064400950 abstract "The cross over from coherent to incoherent exciton transport in disordered polymer films is studied by computationally solving a modified form of the Redfield equation for the exciton density matrix. This theory models quantum-mechanical (ballistic) and incoherent (diffusive) transport as limiting cases. It also reproduces Forster transport for certain parameter regimes. Using model parameters appropriate to polymer thin films it is shown that short-time quantum-mechanical coherence increases the exciton diffusion length. It also causes rapid initial energy relaxation and larger linewidths in agreement with experiment. The route to equilibrium is, however, more questionable, as the equilibrium populations of the model do not satisfy the Boltzmann distributions over the site energies. The Redfield equation for the dimer is solved exactly to provide insight into the numerical results." @default.
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- W2064400950 date "2006-08-30" @default.
- W2064400950 modified "2023-09-24" @default.
- W2064400950 title "Role of quantum coherence and energetic disorder in exciton transport in polymer films" @default.
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- W2064400950 doi "https://doi.org/10.1103/physrevb.74.075207" @default.
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