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The coherence in the secondary emission from quantum well excitons is studied using the speckle method. Analysing the different polarization channels allows to conclude that (i) no coherence loss occurs in the cross-polarized emission, favouring spin beating instead of spin dephasing, and that (ii) the underlying interface disorder has a preferential orientation. The experimental results are successfully...
Summary form only given. With the availability of ultrafast optical measurements, renewed interest was devoted to the properties of the secondary emission from quantum well excitons. It has been shown recently by many experiments, and in particular by means of spectral interferometry, that the early-time secondary emission at low temperature and exciton density is dominated by resonant Rayleigh scattering...
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