Abstract
AbstractThe influence of optical phonons on the exciton dispersion is studied for various coupling strengths as a function of the exciton radius aex. The variational method yields an effective exciton mass which for not too large radii aex (smaller than the polaron‐radii) is reasonably approximated by the bare mass. Only for very large aex, the exciton mass is that of two independent polarons. Corrections to the quadratic dispersion in higher order of the centre of mass momentum are found to be negligible small. The dispersion curves for the materials TlCl and PbI2 are calculated.
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