Abstract
We discuss here so-called `propagation phenomena' in nitrides, i.e. thephenomena of light-matter coupling at the femtosecond and picosecondtime-scales. Specifics of nitrides, namely, giant oscillator strengths of Aand B excitons and extremely important potential disorder in GaN and relatedstructures makes the elastic scattering of light by excitons a dominantprocess that has a huge influence on all kinds of coherent optical spectrum.We show how to extract the oscillator strength and inhomogeneous broadeningfrom the reflection and resonant Rayleigh scattering spectra of GaN-based QWs.Finally, we discuss the stability of excitonic complexes like charged trionsin nitrides and the effect of the free electron-hole plasma on their opticalproperties.
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