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Seminário de Física Teórica

Título: Superconductivity in the two-dimensional Hubbard model based on the exact pair potential

Resumo: We analyze solutions to a superconducting gap equation based on the two-dimensional Hubbard model with nearest and next-to-nearest neighbor hopping. The Cooper pair potential can be calculated exactly and expressed in terms of  standard elliptic functions. The Fermi surfaces at finite temperature and chemical potential are also calculated based on the exact two-body S-matrix of the Hubbard model using the formalism we recently developed, which allows variation of hole doping. The resulting solutions to the gap equation are strongly anisotropic,  namely largest in the anti-nodal direction, and zero in the nodal directions of the Brillouin zone, but not precisely d-wave. Our analysis allows calculation of the critical temperature, and we find Tc/t=0.04, in good agreement with experiments for BSCO.

Local: Sala A2-07 - Andar 1P.

Horário: 15:00.