Abstract
Recent angle-resolved photoemission (ARPES) results for the insulating cuprate have provided experimental data that 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 two-dimensional t-J model were also observed. Here we discuss a comparison between the ARPES results and the quasiparticle dispersion of both (i) the 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 , or the direct oxygen hopping amplitude .
- Received 9 January 1995
DOI:https://doi.org/10.1103/PhysRevB.51.8676
©1995 American Physical Society