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Turkish Journal of Physics

Pairing Mechanism in two Hubbard Models That Show d_{x^2-y^2} Pairing

D.J. SCALAPINO

DOI

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Abstract

Here we examine various aspects of the pairing mechanism for two models, the two-dimensional and two-leg ladder Hubbard models. Both of these models exhibit pairing correlations with d_{x^{2}-y^{2}} symmetry. However, the undoped insulating states of these two systems are different with the two-dimensional lattice characterized by a ground state with long-range antiferromagnetic order and the two-leg ladder having a spin gap in its ground state. Our aim is to gain a better understanding of the underlying pairing mechanism which causes d_{x^{2}-y^{2}} pairing in these two models.

First Page

560

Last Page

575

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