Twinning superlattices

Abstract

A new type of superlattice based on a periodic array of twinned stacking faults is proposed. Such superlattices based on Si and Ge are predicted to be characterised by zero miniband energy gaps, evanescent state derived Bloch minibands and minibands with anomalous dispersion. They can be direct band gap materials and offer the significant benefits of simple chemistry, lack of stress and a favoured technological environment.