Photoemission spectra of ${\rm Sr_2 Cu O_2 Cl_2}$: a theoretical analysis

Details Photoemission spectra of ${\rm Sr_2 Cu O_2 Cl_2}$: a theoretical analysis Photoemission spectra of ${\rm Sr_2 Cu O_2 Cl_2}$: a theoretical analysis

1995-02-21

arxiv.org/abs/cond-mat/9502083v1

Physics

Condensed Matter

11 pages, RevTex version 3.0, 3 postscript figures, LaTeX file and figures have been uuencoded.

Scientific paper

10.1103/PhysRevB.51.8676

Recent angle resolved photoemission (ARPES) results for the insulating cuprate ${\rm Sr_2 Cu O_2 Cl_2}$ have provided the first experimental data which can be directly compared to the (theoretically) well--studied problem of a single hole propagating in an antiferromagnet. The ARPES results reported a small bandwidth, providing evidence for the existence of strong correlations in the cuprates. However, in the same experiment some discrepancies with the familiar 2D ${\rm t-J}$ model were also observed. Here we discuss a comparison between the ARPES results and the quasiparticle dispersion of both (i) the ${\rm t-t'-J}$ Hamiltonian and (ii) the three--band Hubbard model in the strong--coupling limit. Both model Hamiltonians show that the experimentally observed one--hole band structure can be approximately reproduced using reasonable values for ${\rm t'}$, or the direct oxygen hopping amplitude ${\rm t_{pp}}$.

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