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Complete Pseudoparticle Representation and the Conductivity Spectrum of the Hubbard Chain

J. M. P. Carmelo·N. M. R. Peres·D. K. Campbell
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Abstract

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.

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J. M. P. Carmelo, N. M. R. Peres, D. K. Campbell. 1997-01-07. Complete Pseudoparticle Representation and the Conductivity Spectrum of the Hubbard Chain. https://arxiv.org/abs/cond-mat/9609291

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