Determinant Quantum Monte Carlo Study of the Enhancement of d-wave Pairing by Charge Inhomogeneity

Abstract

Striped phases, in which spin, charge, and pairing correlations vary inhomogeneously in the CuO_2 planes, are a known experimental feature of cuprate superconductors, and are also found in a variety of numerical treatments of the two dimensional Hubbard Hamiltonian. In this paper we use determinant Quantum Monte Carlo to show that if a stripe density pattern is imposed on the model, the d-wave pairing vertex is significantly enhanced. We attribute this enhancement to an increase in antiferromagnetic order which is caused by the appearence of more nearly half-filled regions when the doped holes are confined to the stripes. We also observe a π-phase shift in the magnetic order.

arXiv comment10 pages, 16 figures To appear in Phys. Rev. B

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• Enhanced Amplitude for Superconductivity due to Spectrum-wide Wave Function Criticality in Quasiperiodic and Power-law Random Hopping Models
• Enhancement of $d$-wave pairing in the striped phase with the nearest neighbour attraction
• Optimal inhomogeneity for pairing in Hubbard systems with next-nearest-neighbor hopping
• Charge Stripe Manipulation of Superconducting Pairing Symmetry Transition
• Enhancement of the d-wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard~coupling
• $\pi$-Phase shift across stripes in a charge density wave system
• Influence of spin ordering on superconducting correlations in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling
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• Dual role of stripe phase on superconducting correlation in a bilayer square lattice
• Variational Monte Carlo study of stripes as a function of doping in the $t-t^{\prime }$ Hubbard model
• Superconductivity and inhomogeneous charge-ordered state in the two-Dimensional Hubbard model -- Off-Diagonal Wave Function Monte Carlo Studies of Hubbard Model IV