Inter-layer modified \({d}_{{y}^{2}-{z}^{2}}\)-wave superconductivity in an effectively doped spin-1 ladder

We construct a four-leg spin-1/2 t–J type model to simulate a doped two-leg spin-1 antiferromagnetic Heisenberg ladder. Employing renormalized mean-field theory with simple Gutzwiller factors, we obtain three degenerate superconducting states with different pairing symmetry. Through improving the Gu...

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Bibliographic Details
Published inNew journal of physics Vol. 21; no. 11; p. 113047
Main Authors Hou, Jie, Ting-Kuo, Lee, Guo, Yaowu, Lou, Jie, Chen, Yan
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2019
Subjects
Antiferromagnetism
Computer simulation
Decay rate
doped Mott insulator
Mean field theory
Physics
spin-1 ladder
Superconductivity
unconventional superconductivity
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Summary:We construct a four-leg spin-1/2 t–J type model to simulate a doped two-leg spin-1 antiferromagnetic Heisenberg ladder. Employing renormalized mean-field theory with simple Gutzwiller factors, we obtain three degenerate superconducting states with different pairing symmetry. Through improving the Gutzwiller factors, we find that the state C with inter-layer modified \({d}_{{y}^{2}-{z}^{2}}\)-wave pairing has the lowest energy in a large doping range. Besides, we use the density matrix renormalization group method to solve the model. The negative binding energy reveals the pairing tendency, and the pair–pair correlation functions exhibit a slowly decaying behavior on certain types of bonds. From the pair correlations, we confirm the inter-layer modified \({d}_{{y}^{2}-{z}^{2}}\)-wave superconducting state as the ground state of the model.
ISSN:1367-2630
DOI:10.1088/1367-2630/ab5603