Abstract
The deep impurity character of interstitial positive muons or protons in Si and Ge is shown to result from the valley-orbit interaction of the six conduction-band minima along $\ensuremath{\Delta}$. This interaction, much stronger for interstitial than for substitutional point charges, leads to a breakdown of the effective-mass approximation and to the formation of a deep state. This is particularly striking in Ge, where the $\ensuremath{\Delta}$ minima are not the absolute ones.
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