Abstract
Field exciton-vibration spectroscopy of the ZnTe: Ni semiconductor has revealed a local lattice vibrational mode due to the nickel impurity, which is negatively charged relative to the lattice. The electroabsorption spectrum of ZnTe: Ni contains equidistant vibrational replicas of the zero-phonon line of frequency 13±1 THz, which exceeds the limiting phonon frequency in ZnTe by more than twofold. Possible reasons for the formation of the local mode in ZnTe: Ni are analyzed within the concept of ionic-covalent character of ZnTe bonding, and the large width of the local mode resulting from its anharmonicity is discussed.
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