Dynamical correlations in one-dimensional charge-transfer insulators

Details Dynamical correlations in one-dimensional charge-transfer insulators Dynamical correlations in one-dimensional charge-transfer insulators

2000-09-22

arxiv.org/abs/cond-mat/0009357v1

Phys. Rev. B 62, 12707 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 5 figures, to appear in Phys Rev B

Scientific paper

10.1103/PhysRevB.62.12707

The single-particle spectral function and the density response of a two band Emery model for CuO chains is calculated for large on-site Cu repulsion U and large on-site energy difference \Delta. For U>>U-\Delta>>t the eigenfunctions are products of charge and spin parts, which allows analytical calculation of spectral functions in that limit. For other parameters numerical diagonalization is used. The low energy hole carriers are shown to be the one-dimensional analogs of the Zhang-Rice singlets. The validity of the one-band model is discussed. The results are relevant to the interpretation of photoemission and EELS experiments on SrCuO2 and Sr2CuO3 .

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