Hubbard model with SU(4) symmetry
| dc.creator | Pivovarov, Eugene | |
| dc.date | 1998-07-23 | |
| dc.date.accessioned | 2026-07-07T03:11:07Z | |
| dc.date.available | 2026-07-07T03:11:07Z | |
| dc.description | In the model considered, the nonlocal interaction of the fermions in different sublattices of a bipartite lattice is introduced. It can also be regarded as local interaction of fermions with opposite ``hypercharge''. The corresponding term in the Hamiltonian is SU(4)-invariant and appears to be the most tractable version of the SO(5)-invariant model that unifies antiferromagnetic and d-wave superconducting order parameters. The model has been studied primarily in the weak interaction limit and in the mean field approximation. Near the half-filling the antiferromagnetic critical temperature has a peak. However, the superconducting transition takes place when the Fermi surface crosses the area where the density of states is of order of inverse coupling coefficient. Thus, in mean-field approximation, there exist an interval of values of the chemical potential, for which the system is a superconductor for arbitrary high temperatures. The temperature dependence of specific heat, Hall coefficient, and DC conductivity in the normal phase agrees with that experimentally observed in high-$T_c$ cuprates. | |
| dc.description | 8 pages, 2 figures, REVTeX, AMSFonts | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9807291 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9807291 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/28453 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Hubbard model with SU(4) symmetry | |
| dc.type | text |