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Bound States of Fermions on 2d Lattice in a Dilute Limit

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We examine extended bound states in a dilute limit of the extended Hubbard model on the two-dimensional square lattice. By solving exactly the two-body problem we have determined the binding energies, mobilities, and dispersion curves across the Brillouin zone for bound states of various symmetries. It turns out that the d-wave pairing is strongly favored by the nnn hopping and the intersite local pairs can have small effective masses, even in the case of strong binding.We have also found a possibility of extended s-d_{x^{2}-y^{2}} mixing of the bound states.
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  • Institute of Physics A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
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  • Institute of Physics A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
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bwmeta1.element.bwnjournal-article-appv97z124kz
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