Abstract
Abstract The oxacyanine Scheibe aggregate is modelled by a two-dimensional cubic nonlinear Schrodinger equation with multiplicative noise, accounting for thermal fluctuations. For a possible choice of the physical parameters collapse of the initial state representing the Mobius-Kuhn coherent exciton may occur. The collapse time then increases with temperature. From experimental observations Mobius and Kuhn find a lifetime of the exciton which also increases with temperature. We finally consider soliton motion close to an impurity representing the acceptor molecule in the Scheibe aggregate.
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