Hole pairing in the Hubbard model
Por:
Pérez L.A., Wang C.
Publicada:
1 ene 1998
Resumen:
The hole-pairing problem at the dilute limit on low-dimensional bipartite and non-bipartite lattices is studied by means of the generalized Hubbard model, in which on-site (U), nearest-neighbor (V), and assisted-hopping (?t) terms are considered. The problem is addressed by mapping the original many-body problem onto a tight-binding one in a higher-dimensional space. It is found that there is a small region around ?t/t0 = 0.5, where the pairing of holes is enhanced and non-pairing of electrons exists. Pairing phase diagrams are analyzed for linear, square and triangular lattices, in comparison with those results obtained from the extended Hubbard model. © 1998 Elsevier Science B.V. All rights reserved.
Filiaciones:
Pérez L.A.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, 04510, Mexico D.F., Mexico
Wang C.:
Inst. de Invest. en Materiales, UNAM, A.P. 70-360, 04510, Mexico D.F., Mexico
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