Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-01-14
Physics
Condensed Matter
Strongly Correlated Electrons
LaTeX, 32 pages, no Figures. To be published in Phys. Rev. B (15th of August 1997)
Scientific paper
10.1103/PhysRevB.56.3717
We introduce the pseudohole and heavy-pseudoparticle operator algebra that generates all Hubbard-chain eigenstates from a single reference vacuum. In addition to the pseudoholes already introduced for the description of the low-energy physics, this involves the heavy pseudoparticles associated with Hamiltonian eigenstates whose energy spectrum has a gap relatively to the many-electron ground state. We introduce a generalized pseudoparticle perturbation theory which describes the relevant finite-energy ground state transitions. In the present basis these excitations refer to a small density of excited pseudoparticles. Our operator basis goes beyond the Bethe-ansatz solution and it is the suitable and correct starting point for the study of the finite-frequency properties, which are of great relevance for the understanding of the unusual spectral properties detected in low-dimensional novel materials.
Carmelo Jose. M. P.
Peres Nuno. M. R.
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