Emergence of dxy-wave superconductivity in a doped two-leg diagonal ladder
Jie Hou, Ting-Kuo Lee, Jie Lou, Yan Chen
DOI 10.1103/PhysRevB.99.094510 · Physical Review B
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Abstract
We propose a doped two-leg spin-1/2 diagonal ladder model (or a composite spin model) to simulate a doped spin-1 chain. By using the density matrix renormalization group method for an open chain, we find that the ground state hosts a dominant singlet dxy-wave superconducting correlation with features similar to those of the spin-1 Haldane phase. Meanwhile, we apply the renormalized mean-field theory to the model and obtain a dxy-wave superconducting state. The superconducting order exhibits a domelike shape as a function of hole concentration δ. Our work provides a physical understanding of the origin of dxy pairing symmetry, which originates from antiferromagnetic Heisenberg interaction in the diagonal direction, and the intrachain hopping term makes it stable.
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