Abstract
The interaction between an excited electron and a large-radius exciton (Wannier-Mott exciton) has been studied in the visible and ultra-violet frequency regions for a two-level system of a molecular solid. Using a self-consistent approach, it is shown that at low temperatures and when certain conditions prevail, a bound-state may exist arising from the electron-exciton pairing. The excitation spectrum is found to be of the superconductivity type and the electron- exciton quasiparticle migrates through the crystal with definite energy and wave vector. The gap function due to the electron-exciton pairing is calculated at zero temperature and then the expression for the transition temperature is established. A formula for the ground-state energy is derived corresponding to the electron-exciton pairing and a discussion of the parameters that appear in the theory is presented.
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