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

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

1999-09-06

arxiv.org/abs/cond-mat/9909089v3

Proceedings of XXII International School of Theoretical Physics: "Quantum Coherence in Superconductors and Nanostructures", Us

Physics

Condensed Matter

Superconductivity

11 pages, 6 embedded EPS figures

Scientific paper

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.

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