The Conductivity Tensor for the Hubbard Model
arXiv:cond-mat/9910463 · doi:10.1016/S0375-9601(99)00616-7
Abstract
A new theoretical analysis of the current-charge and charge-charge propagators is presented for the Hubbard model, using the static approximation for the Composite Operator Method. This approximation manifestly preserves a sum rule which governs the single-site dynamics. We compare our results with those obtained by numerical analysis.
14 pages, 3 EPS figures, RevTeX, to be published in Physics Letters A