Superconductivity in a correlated two-dimensional Hubbard model: A theoretical study |
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Authors: | ES Caixeiro A Troper |
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Institution: | a Centro Brasileiro de Pesquisas Fisicas, R. Xavier Sigaud 150, Rio de Janeiro 22290180, Brazil b Universidade do Estado do Rio de Janeiro, R. São Francisco 524, Rio de Janeiro 20550013, Brazil |
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Abstract: | In this work we study the superconductivity within an attractive two-dimensional one-band Hubbard model. We consider a d-wave superconducting gap and a Hubbard-I approximation to describe the strongly correlated superconducting regime. We use Green's function method to obtain the order parameter Δ and the superconducting critical temperature Tc. The results show that for fixed values of the superconducting attractive potential U (U<0), the gap increases for low temperatures, whereas diminishes abruptly as the temperature increases. The effect of pressure can be discussed, varying the next-nearest-neighbors hopping t2, yielding a change in Tc, and also in Δ0. |
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Keywords: | Hybridization Superconductivity Two-band |
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