1996/09/30 by J. M. P. Carmelo, N. M. R. Peres, Carmelo, J. M. P. +3
Mathematics · #Advanced Topics in Algebra #Algebraic structures and combinatorial models #Condensed Matter (cond-mat) #FOS: Physical sciences #Homotopy and Cohomology in Algebraic Topology
paper · pdf · doi:10.48550/arxiv.cond-mat/9609291
openalex publication_date 1996/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We use a complete pseudoparticle operator representation to study the explicit form of the finite-frequency conductivity for the Hubbard chain. Our study reveals that the spectral weight is mostly concentrated at the ω=0 Drude peak (except at density n=1) and at an absorption starting just below twice the value of the chemical potential whose ω-dependence we evaluate exactly. We also obtain the exact ωdependence of the higher-energy, less-pronounced absorption edges, whose weights vanish for large on-site interaction U.