Abstract
The exact ground state properties of the Peierls-Hubbard model with site-off-diagonal electron-phonon (e-ph) coupling are numerically calculated. It is shown that the lattice is always distorted however the e-ph coupling constant is small. Dynamical bond strength (DBS) including the effects of the correlated motion of electrons and ions is introduced to describe the itinerancy of the electron in this system. From the analysis of DBS, the Coulomb repulsion is shown to enhance itinerancy of the electrons in the strongly coupled e-ph system with higher phonon frequency. This can be interpreted in terms of the concept of coherent hopping which is the consequence of the cooperative motion of the strongly correlated electrons and rapidly oscillating lattice system.
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