We propose a configuration interaction mechanism that leads to hole pairs with zero repulsion energy which are exact eigenstates of the two-band Hubbard Hamiltonian. The two-hole pairs have 1B2(xy) symmetry and arise from degenerate states at the Fermi level; we show that they must exist independently of the band filling. To discuss the possible relevance of these states to the problem of pairing in high-Tc superconductors we solve five- and nine-site model clusters with four holes. The quasiparticles become dressed by the interaction with the background holes and get paired with a set of valence band parameters well established for high-Tc cuprates. We predict a number of important experimental facts such as binding energies of the correct order of magnitude, the 1B1 (x2 - y2) symmetry of the order parameter and the singlet-triplet energy separation of the Cooper pairs.
Cini M., B.A. (1996). Two-hole quasiparticles and pairing in the Hubbard model of high-Tc superconducting cuprates. JOURNAL OF PHYSICS. CONDENSED MATTER, 8(17).
Tipologia: | Articolo su rivista |
Citazione: | Cini M., B.A. (1996). Two-hole quasiparticles and pairing in the Hubbard model of high-Tc superconducting cuprates. JOURNAL OF PHYSICS. CONDENSED MATTER, 8(17). |
IF: | Con Impact Factor ISI |
Lingua: | English |
Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica della Materia |
Revisione (peer review): | Sì, ma tipo non specificato |
Tipo: | Articolo |
Rilevanza: | Rilevanza internazionale |
Stato di pubblicazione: | Pubblicato |
Data di pubblicazione: | 1996 |
Titolo: | Two-hole quasiparticles and pairing in the Hubbard model of high-Tc superconducting cuprates |
Autori: | |
Autori: | Cini M., Balzarotti A. |
Appare nelle tipologie: | 01 - Articolo su rivista |