The hard-core property of the Frenkel exciton is explicitly taken into account in the interaction of conduction electrons with a polarizable medium. The excitonic polaron bandwidth is less narrowed than in the boson approximation, does not vanish for infinite coupling, and is temperature independent. One consequence is that at high temperature the polaron motion is not dominated by hopping, but still contains a contribution from band motion.
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Robert A. Bari (1973) studied this question.
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