Pseudopotential theory of the alloy broadening of defect levels

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Abstract
We have studied the effect of the alloy fluctuation potential in Hg1−x Cd x Te on the shallow acceptor and donor states by an empirical pseudopotential model. The root mean squares of the broadenings are calculated by a simple perturbation theory for x from 0.2 to 1.0. We found that the shallow acceptors are broadened by about 5 meV with the maximum broadening occurring at x = 0.6 and the shallow donors are broadened by a maximum amount of 1 meV at x = 0.8. Estimates of the broadening of deep levels indicate an upper bound of 0.1 eV.

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