Abstract
The effect of isotopic substitution in a model polaronic system is presented. The authors use a three-site many body electron-phonon model which includes electronic correlations and electron-phonon interactions, showing the presence of polaron tunneling for intermediate and strong couplings. The isotopic substitution changes the dynamics of polaron tunneling. Additionally in the intermediate electron-phonon coupling regime, relevant for high-Tc superconductors, a change in the local structure is predicted. In this regime, the isotopic shift of phonon excitations is consistent with results of optical measurements of c-axis phonons in YBa{sub 2}Cu{sub 3}O{sub 7}.
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