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Effects of disorder on electronic conduction properties at subsidiary energy minima in ternary InGaAs alloys

The effects of disorder on the electronic conduction properties at subsidiary energy minima (upper valleys) of In0.53Ga0.47As alloys are evaluated using a novel Monte Carlo supercell approach with both the bond-length and bond-angle fluctuations considered. It is found that the width of the spectral function obtained in the present approach is much larger than that obtained using the coherent-potential approximation (CPA). This result indicates that the bond-length and the bond-angle fluctuations-which are not sufficiently considered in the CPA framework-induce strong effects on the electronic properties of the upper valleys.