Crystals

Abstract:- An equation of motion technique of quantum dynamics and Dyson equation approach have been used to obtain Fourier transformed electron Green`s function in presence of isotopic impurity and anharmonicity Hamiltonian has been taken as a sum of harmonic part, electron part, defect part, electron phonon interaction part, anharmonic part.The anharmonicity has been taken upto quartic terms. The response function has been obtained responsible for electron phonon linewidth. At high temperature, an expression of electron density of states (EDOS) has been obtained according to different fields present in semiconductor continuum. An EDOS has been also influenced by perturbed mode energy.The effect on intensity of peaks with respect to temperature and different excitations has been undertaken in this framework