2017
DOI: 10.1209/0295-5075/117/67007
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Topological phase transition from nodal to nodeless d-wave superconductivity in electron-doped cuprate superconductors

Abstract: -Unlike the hole-doped cuprates, both nodal and nodeless superconductivity (SC) are observed in the electron-doped cuprates. To understand these two types of SC states, we propose a unified theory by considering the two-dimensional t-J model in proximity to an antiferromagnetic (AF) long-range ordering state. Within the slave-boson mean-field approximation, the d-wave pairing symmetry is still the most energetically favorable even in the presence of the external AF field. In the nodal phase, it is found that t… Show more

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Cited by 4 publications
(2 citation statements)
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“…In another context, the d-wave pairing was shown by MFT to be stable, and the quasiparticle excitation becomes nodeless, on a strong Neel background. 42,43 It is natural that the energetic ordering of the states in different symmetries depends on the starting model, and on the method by which the strong correlation effects are addressed.…”
Section: Finite Dopingmentioning
confidence: 99%
“…In another context, the d-wave pairing was shown by MFT to be stable, and the quasiparticle excitation becomes nodeless, on a strong Neel background. 42,43 It is natural that the energetic ordering of the states in different symmetries depends on the starting model, and on the method by which the strong correlation effects are addressed.…”
Section: Finite Dopingmentioning
confidence: 99%
“…Note that the interband pairing between hole band and high energy electron band only contributes second order perturbation corrections to the gap structure, but is unable to alter its symmetry. The d-wave gap nodes carrying one unit of vorticity in the Nambu space are topologically protected [42,43]. Within the AB layer, there are only two ways to destroy these nodes.…”
Section: Pmentioning
confidence: 99%