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Abstract
AbstractIt is shown that both Urbach's rule (exponentially increasing absorption edge) and the large fluctuations of the phase of transmitted light observed in depolarization experiments can be derived from the same phenomenon, namely the fluctuating exciton resonance energy caused by the fluctuations in the phonon number in thermal equilibrium. A simple layer model is applied in order to derive quantitative results for absorption and phase fluctuation. The comparison of these results with experimental values for ZnO yields a good agreement. A coherence length of the LO phonons interacting with excitons is also obtained.
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