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We have studied the exciton dynamics and spin-flip processes in tensile strained GaAs 1-y P y /Ga 0.65 Al 0.35 As quantum wells as a function of phosphorous composition and well width. The strain introduced by the presence of phosphorous modifies the valence band structure. This strongly affects the characteristic times of exciton...
We have studied the dimensionality dependence of the behavior of Fano resonances in the photoluminescence excitation spectra of GaAs-Al x Ga 1-x As heterostructures in a magnetic field applied in the Faraday configuration. A striking difference is observed between quasi-two and quasi-three-dimensional systems: while the Fano profiles evolve into Lorentzian lineshapes in...
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