Topological doping of repulsive Hubbard models

Details Topological doping of repulsive Hubbard models Topological doping of repulsive Hubbard models

2003-08-12

arxiv.org/abs/cond-mat/0308228v1

Physica B 339, 51-59 (2003)

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1016/S0921-4526(03)00492-7

The spin configuration induced by single holes and hole pairs doped into stoichiometric, antiferromagnetic cuprates is considered. Unrestricted Hartree-Fock calculations for the three-band Hubbard model are employed to study spin-polaron and vortex-like (meron) solutions. Meron solutions for a single hole are found to be metastable with higher energy than spin polarons. We observe that the meron solution shifts from site-centered to bond-centered as the interaction is increased. Meron-antimeron solutions for hole pairs are found to be unstable. The results are in agreement with earlier findings for the one-band Hubbard model. However, we find that the Hubbard interaction of the one-band model has to be chosen similar to the one of the three-band model to obtain comparable results, not of the order of the charge-transfer gap, as previously expected.

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