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Using the many-body quantum dynamics and Dyson’s equation formalism, the phonon Green’s function has been developed via a Hamiltonian that includes the contribution of harmonic electron and phonon field and their interaction, phonon field anharmonicities and defects. The renormalized electron–phonon dispersion is obtained using the modified form of Born–Mayer–Huggins potential (MBMHP) and phonon Green’s...
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