We compare the dynamical properties of AlχGa1-χAs AlyGa1-yAs superlattices, AlxGa1-xAs homogeneous alloys and GaAs AlAs superlattices. The interplay between the local compositional disorder of the lattice and the order imposed by the superperiodicity is investigated within a Bond Charge Model dynamics, Mass Defect perturbation, Average t-matrix Approximation as well as by a supercell approach. We describe both the acoustic disorder-activated and the optical quantized modes by means of the calculation of the dielectric function and the Raman intensity in backscattering geometry within the Bond Polarizability model. © 1991.
Bernasconi, M., Colombo, L., Miglio, L., Molteni, C. (1991). ORDER-DISORDER INTERPLAY IN ALZGA1-ZAS SUPERLATTICES - CALCULATION OF INFRARED AND RAMAN-SPECTRA. SUPERLATTICES AND MICROSTRUCTURES, 10(2), 153-156 [10.1016/0749-6036(91)90221-C].
ORDER-DISORDER INTERPLAY IN ALZGA1-ZAS SUPERLATTICES - CALCULATION OF INFRARED AND RAMAN-SPECTRA
BERNASCONI, MARCO;MIGLIO, LEONIDA;
1991
Abstract
We compare the dynamical properties of AlχGa1-χAs AlyGa1-yAs superlattices, AlxGa1-xAs homogeneous alloys and GaAs AlAs superlattices. The interplay between the local compositional disorder of the lattice and the order imposed by the superperiodicity is investigated within a Bond Charge Model dynamics, Mass Defect perturbation, Average t-matrix Approximation as well as by a supercell approach. We describe both the acoustic disorder-activated and the optical quantized modes by means of the calculation of the dielectric function and the Raman intensity in backscattering geometry within the Bond Polarizability model. © 1991.
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