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Magnetic polarons in the two-dimensional Hubbard model

1988; American Physical Society; Volume: 38; Issue: 13 Linguagem: Inglês

10.1103/physrevb.38.8879

1095-3795

W. P. Su, X. Y. Chen,

Advanced Condensed Matter Physics

Following the work of Schrieffer, Wen, and Zhang on the ``spin-bag'' mechanism we study the formation of magnetic polarons in the two-dimensional Hubbard model in the Hartree-Fock approximation. The profile and effective mass of the polarons are caclulated for various U over t ratios. The static potential between two polarons is presented for various spin and charge configurations. The effect of the nearest-neighbor repulsion is also considered. The relevance of the results to high-${T}_{c}$ superconductivity is discussed.