Suppression ofd-wave superconductivity in the checkerboard Hubbard model Article Swipe

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pairing checkerboard hubbard model physics superconductivity condensed matter physics quantum monte carlo cuprate spin (aerodynamics) energy (signal processing) monte carlo method quantum mechanics statistics thermodynamics mathematics geometry

D. G. S. P. Doluweera , Alexandru Macridin , Thomas Maier , Mark Jarrell , Th. Pruschke ·

YOU? · · 2008 · Open Access · · DOI: https://doi.org/10.1103/physrevb.78.020504 · OA: W2016648516

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.