Excitons near interfaces of polar crystals

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Abstract
A new model describing an interface exciton for the cases where the image potentials of the electron and hole are attractive one-dimensional Coulomb-like potentials is proposed. The model describes the exciton by a combination of a planar exciton and localized motions of the electron and hole to the interface in the direction perpendicular to it. Numerical calculations are carried out to investigate the contributions of the bulk and surface LO phonons to the ground-state energy of the exciton, and the conditions for which the model becomes increasingly accurate are discussed.