Extended bound states of fermions on 2D square lattice beyond the nn hopping and interactions

Maciej Bak; Roman Micnas

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Extended bound states of fermions on 2D square lattice beyond the nn hopping and interactions

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arxiv cond-mat/9909089 v3 pith:TGZFQDAI submitted 1999-09-06 cond-mat.supr-con cond-mat.str-el

Extended bound states of fermions on 2D square lattice beyond the nn hopping and interactions

Maciej Bak , Roman Micnas This is my paper

classification cond-mat.supr-con cond-mat.str-el

keywords boundstatesextendedhoppinginteractionslatticesquareacross

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We examine extended bound states in the dilute limit of the extended Hubbard model with next-nearest-neighbour (nnn) hopping and nnn interactions on the two dimensional square lattice. By the exact solution of a two-body problem we show that d-wave pairing is strongly favored by the nnn hopping. We determine the binding energies, mobilities and dispersion curves across Brillouin zone (B.z.) for bound states of various symmetries. The numerical analysis shows that the deep bound states can exist in the whole B.z. and we have also found s*-d mixing of the bound states.

Extended bound states of fermions on 2D square lattice beyond the nn hopping and interactions

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