Abstract
The influence of alloying on optical vibrations in GaAs/Ga 1− x Al xAs superlattices is theoretically studied. To calculate frequencies and effective atomic displacements two different approaches are applied. The random-element-isodisplacement model is generalized for layered structures under inclusion of the macroscopic electric field. Parallel to it vibrational properties are studied by means of numerical simulations of alloying and randomness. Two effects, confinement versus folding and interface character, are discussed in particular.
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