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Abstract
We present first-principles relativistic pseudopotential calculations of the structural and electronic properties of the quaternary alloy GaAlAsN. We have found a surprising band-gap collapse, in contrast to the empirical and first-principles virtual-crystal approximation (VCA) calculations that predict a wide band gap. Unusually strong structural relaxation caused by large differences in the strength of the chemical bonds between the m-V ions in the alloy invalidates the VCA and leads to the band-gap collapse. These results have important implications for other complex semiconductor alloys. [S0163-1829(98)00108-8].
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