TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.7.4.046
TI  - Unfrustrating the t-J Model: d-wave BCS Superconductivity in the t'-J_z-V Model
PY  - 2019/10/09
UR  - https://scipost.org/SciPostPhys.7.4.046
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 7
IS  - 4
SP  - 046
A1  - Slagle, Kevin
AB  - 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.
ER  -

@Article{10.21468/SciPostPhys.7.4.046,
	title={{Unfrustrating the t-J Model: d-wave BCS Superconductivity in the t'-J_z-V Model}},
	author={Kevin Slagle},
	journal={SciPost Phys.},
	volume={7},
	pages={046},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.7.4.046},
	url={https://scipost.org/10.21468/SciPostPhys.7.4.046},
}