We calculate the optical properties of the Al(x)Ga(1-x)As mixed crystal in a bond-charge-model, average-t-matrix-approximation (ATA), and mass-defect scheme. Comparison is made with numerical results obtained by a supercell procedure and with recent experimental measurements. The predictive power and the limits of the perturbative approach in the 50% concentration range are discussed, in view of a useful application of the ATA technique to the Al(x)Ga(1-x)As superlattices, which will be investigated in the following paper.
Bernasconi, M., Colombo, L., Miglio, L., Benedek, G. (1991). VIBRATIONAL PROPERTIES AND INFRARED-SPECTRA OF ALXGA1-XAS SYSTEMS .1. AVERAGE-T-MATRIX APPROXIMATION VERSUS SUPERCELL CALCULATION FOR HOMOGENEOUS ALLOYS. PHYSICAL REVIEW. B, CONDENSED MATTER, 43(18), 14447-14456 [10.1103/PhysRevB.43.14447].
VIBRATIONAL PROPERTIES AND INFRARED-SPECTRA OF ALXGA1-XAS SYSTEMS .1. AVERAGE-T-MATRIX APPROXIMATION VERSUS SUPERCELL CALCULATION FOR HOMOGENEOUS ALLOYS
BERNASCONI, MARCO;MIGLIO, LEONIDA;BENEDEK, GIORGIO
1991
Abstract
We calculate the optical properties of the Al(x)Ga(1-x)As mixed crystal in a bond-charge-model, average-t-matrix-approximation (ATA), and mass-defect scheme. Comparison is made with numerical results obtained by a supercell procedure and with recent experimental measurements. The predictive power and the limits of the perturbative approach in the 50% concentration range are discussed, in view of a useful application of the ATA technique to the Al(x)Ga(1-x)As superlattices, which will be investigated in the following paper.
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