Complete Pseudoparticle Representation and the Conductivity Spectrum of the Hubbard Chain

Details Complete Pseudoparticle Representation and the Conductivity Spectrum of the Hubbard Chain Complete Pseudoparticle Representation and the Conductivity Spectrum of the Hubbard Chain

1996-09-30

arxiv.org/abs/cond-mat/9609291v2

Physics

Condensed Matter

LaTeX file, no figures, 11 pages

Scientific paper

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 \omega =0 Drude peak (except at density n=1) and at an absorption starting just below twice the value of the chemical potential whose \omega-dependence we evaluate exactly. We also obtain the exact \omega dependence of the higher-energy, less-pronounced absorption edges, whose weights vanish for large on-site interaction U.

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