We study the effects of intersite RKKY-like interactions in the mixed valence regime of a two-band extended Hubbard model. This model is known to display a metallic non-Fermi liquid state with spin-charge separation in the standard D=∞ limit (where interactions lead to purely on-site fluctuations only). Using an extended D=∞ approach, we find that the spin-charge separation survives the quantum fluctuations associated with arbitrary intersite density-density interactions and a finite range of intersite spin-exchange interactions. We determine the qualitative behavior of the spin, charge, and single-particle correlation functions. The implications of these results for the solution in finite spatial dimensions are discussed.
@article{arxiv.cond-mat/9705140,
title = {Intersite Fluctuations and Spin-Charge Separation in the Extended Hubbard Model},
author = {J. Lleweilun Smith and Qimiao Si},
journal= {arXiv preprint arXiv:cond-mat/9705140},
year = {2008}
}