Abstract
We have investigated the ground state of a single hole in the half-filled Hubbard model on a 2D square lattice using the coupled- cluster method. In the strong-coupling limit we have obtained an analytical expression of the hole energy dispersion ϵ( k ) with several of its features consistent with earlier studies of the Hubbard model and t-J model. An appreciable discrepancy on the hole bandwidth is, however, found between the Hubbard model and the t-J model. We believe that this discrepancy is due to the absence of the three-site hopping term in the t-J model.
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