Edge superconducting correlation in the attractive-U Kane-Mele-Hubbard model
Jie Yuan, Jin-Hua Gao, Wei-Qiang Chen, Fei Ye, Yi Zhou, Fu-Chun Zhang
DOI 10.1103/PhysRevB.86.104505 · Physical Review B
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Abstract
The two-dimensional Kane-Mele model with attractive Hubbard interaction U is studied by using a self-consistent mean-field theory. At U=0, the ground state is a topological insulator. At U larger than a critical value Uc, the ground state is a bulk superconductor. At 0<U<Uc, the bulk remains insulating while the edge state shows superconducting correlation. The effective model for the edge superconducting state is discussed.
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