Remarks on correlations of negative-U centre effects and low-temperature anomalies (structural changes) in glassy semiconductors

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Abstract
A general correlation of high-energy excitations of negative-U centres with metastable structural changes in glassy semiconductors is shown to follow from a recent theory identifying the negative-U centres with self-trapped electron and hole pairs. Some related effects characteristic of glassy semiconductors are considered. Correlations between the selftrapped pair excitations and low-temperature anomalies in the glasses are discussed.