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• W2949778801 abstract "The t-J model is believed to be a minimal model that may be capable of describing the low-energy physics of the cuprate superconductors. However, although the t-J model is simple in appearance, obtaining a detailed understanding of its phase diagram has proved to be challenging. We are therefore motivated to study modifications to the t-J model such that its phase diagram and mechanism for d-wave superconductivity can be understood analytically without making uncontrolled approximations. The modified model we consider is a $t'$-$J_z$-$V$ model on a square lattice, which has a second-nearest-neighbor hopping $t'$ (instead of a nearest-neighbor hopping $t$), an Ising (instead of Heisenberg) antiferromagnetic coupling $J_z$, and a nearest-neighbor repulsion $V$. In a certain strongly interacting limit, the ground state is an antiferromagnetic superconductor that can be described exactly by a Hamiltonian where the only interaction is a nearest-neighbor attraction. BCS theory can then be applied with arbitrary analytical control, from which nodeless d-wave or s-wave superconductivity can result." @default.
• W2949778801 created "2019-06-27" @default.
• W2949778801 creator A5061305555 @default.
• W2949778801 date "2019-10-09" @default.
• W2949778801 modified "2023-10-17" @default.
• W2949778801 title "Unfrustrating the t-J Model: Exact d-wave BCS Superconductivity in the t'-J_z-V Model" @default.
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• W2949778801 doi "https://doi.org/10.21468/scipostphys.7.4.046" @default.
• W2949778801 hasPublicationYear "2019" @default.
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