Suppression of d-wave superconductivity in the checkerboard Hubbard model

Details Suppression of d-wave superconductivity in the checkerboard Hubbard model Suppression of d-wave superconductivity in the checkerboard Hubbard model

2008-06-09

arxiv.org/abs/0806.1504v1

Physics

Condensed Matter

Superconductivity

Five pages, four figures. Accepted for Phys. Rev. B (Rapid Com.)

Scientific paper

10.1103/PhysRevB.78.020504

Using a dynamical cluster quantum Monte Carlo approximation we investigate the d-wave superconducting transition temperature $T_c$ in the doped 2D repulsive Hubbard model with a weak inhomogeneity. The inhomogeneity is introduced in the hoppings $\tp$ and $t$ in the form of a checkerboard pattern where $t$ is the hopping within a $2\times2$ plaquette and $\tp$ is the hopping between the plaquettes. We find inhomogeneity suppresses $T_c$. The characteristic spin excitation energy and the strength of d-wave pairing interaction decrease with decreasing $T_c$ suggesting a strong correlation between these quantities.

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