Angle resolved Cu and O photoemission intensities in CuO_2 planes

Details Angle resolved Cu and O photoemission intensities in CuO_2 planes Angle resolved Cu and O photoemission intensities in CuO_2 planes

1998-12-18

arxiv.org/abs/cond-mat/9812325v1

Phys. Rev. B 59, 14 092 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 3 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.14092

Using a mapping from the three-band extended Hubbard model for cuprate superconductors into a generalized t-J model, and exact diagonalization of the latter in a 4x4 cluster, we determine the quasiparticle weight for destruction of a Cu or an O electrons with definite wave vector k. We also derive an approximate but accurate analytical expression which relates the O intensity with the quasiparticle weight in the generalized t-J model, and use it to obtain the O intensity from results of the self-consistent Born approximation. The k-dependence of Cu and O intensities is markedly different. In particular the O intensity vanishes for k=(0,0). Our results are relevant for the interpretation of angle-resolved photoemission experiments.

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