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Effects of the exciton dispersion on the properties of polariton solitons in gyrotropic and nongyrotropic crystals are investigated. Bell- and kink-type solutions are obtained, and the conditions for their existence are determined. For excitons with a positive effective mass, a change of the type of the solution is shown to take place at a critical point on the lower polariton branch, accompanied by a critical behavior of the soliton's width and amplitude.
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Stoychev et al. (1992) studied this question.
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