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Superconducting states in frustrating t-J model: A model connecting high-$T_c$ cuprates, organic conductors and Na$_x$CoO$_2$
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abstract
The two-dimensional t-J model on a frustrating lattice is studied using mean-field variational theories with Gutzwiller approximation. We find that a superconducting state with broken time-reversal symmetry (d+id state) is realized in the parameter region close to the triangular lattice. The frustration enlarges the region of superconductivity when $t<0$ for the hole-doped case, which is equivalent to $t>0$ for electron doping. We also discuss the SU(2) degeneracy at half-filling. The d+id state probably corresponds to the spin gap state at half-filling.
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Topological chiral superconductivity from antiferromagnetic correlations in moir\'{e} bands with extreme spin-orbit coupling
The energetically favored superconducting pairing in two strong-coupling models of twisted bilayer WSe2 is chiral and topological, with p/d wave mixing and Chern number ±1 or ±2.
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