Abstract
Based on the structural properties of the zinc-blende lattice, a model Hamiltonian is proposed to describe singly and doubly occupied impurity states with large lattice relaxation. One-electron impurity levels are proposed to be connected with the anomalous persistent free-particle excitations. The impurity band of the bound pair states might show Bose condensation and superconducting properties at high temperature. Combined with available band-structure data, the metastability and other properties of this model are discussed.
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