Charge Conjugation and Pairing in a model Cu$_{5}$O$_{4}$ Cluster

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dc.creatorCini, Michele
dc.creatorBalzarotti, Adalberto
dc.creatorStefanucci, Gianluca
dc.date1998-11-09
dc.date.accessioned2026-07-07T03:12:02Z
dc.date.available2026-07-07T03:12:02Z
dc.descriptionHighly-symmetric three-band Hubbard Cu-O clusters have peculiar properties when the hole number is such that they admit W=0 hole pairs. These are two-hole eigenstates of the on-site Hubbard repulsion with eigenvalue 0, get bound by correlation effects when dressed by the interaction with the background, and cause superconducting flux quantization. We study the Cu$_{5}$O$_{4}$ cluster by exact diagonalization and show that bound electron pairs of $^{1}$% B$_{2}$ symmetry are obtained at an appropriate filling, and quantize flux like the hole pairs. The basic mechanism for pairing in this model is the second-order exchange diagram, and an approximate charge conjugation symmetry holds between electron and hole pairs. Further, the flux quantization property requires that the W=0 pairs of $d$ symmetry have $s$ symmetry couterparts, still with W=0; the former are due to a spin fluctuation, while the latter arise from a charge fluctuation mechanism. The simultaneous existence of both is an essential property of our model and is required for any model of superconducting $d$ pairs.
dc.description6 pages, 4 enbedded figures
dc.identifierhttps://arxiv.org/abs/cond-mat/9811116
dc.identifierhttp://arxiv.org/abs/cond-mat/9811116
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28760
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleCharge Conjugation and Pairing in a model Cu$_{5}$O$_{4}$ Cluster
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