Abstract
Feynman path-integral quantum Monte Carlo (QMC) simulations have been employed to evaluate the charge and spin fluctuations in quasi one-dimensional chains as well as the probabilities to find 0, 1, 2 electrons at the associated ith lattice-site. The QMC data have been derived as a function of the on-site density 〈 n i 〉 and the ratio between the two-electron repulsion and kinetic hopping. An extended Hubbard—Hamiltonian has been used as underlying model-operator. Increasing electronic correlations in the neighborhood of the half-filled band sector cause a decoupling of charge and spin degrees of freedom.
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