Wannier exciton in a polarizable field

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Abstract
An expression for calculating the state energies of a Wannier exciton, interacting with a crystalline polarization field, is derived. The derived expression is applicable for arbitrary values of the electron-hole binding. This expression is applied to calculate the binding energy of a Wannier exciton in the ionic polarization field for a number of polar semiconductors. The results obtained are discussed in relation to experimental results and some comments on the previous calculations of other authors and the present authors are drawn.