A Frenkel exciton is an exciton whose internal excitation is concentrated on the scale of one molecule or unit cell. The local excitation can transfer between sites; localized internal structure does not require an immobile center of mass. The large-radius Wannier-Mott exciton approximation cannot simply be extrapolated to this limit.[ref]
Excitons in Semiconductor Quantum Dots by Matjaž Humar. §3, printed p. 6: small-radius Frenkel contrast
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