Superconductivity in the Three-Fold Charge-Ordered Metal of the Triangular-Lattice Extended Hubbard Model

Abstract

The quarter-filling extended Hubbard model on the triangular lattice is studied to explore pairing instability in the three-fold charge-ordered (CO) metal. We derive a second-order strong-coupling effective Hamiltonian of doped carriers into the three-fold CO insulator at electron density of $n=2/3$, and then study the $f$- and $d_{xy}$-wave superconductivities down to $n=1/2$ by using the BCS mean-field approximation. It is found that the triplet $f$-wave pairing is more stable than the $d_{xy}$-wave one. We also point out that this coexisting state of the charge ordering and superconductivity is possible to have critical temperature $T_c\sim 0.01t$.

4 pages, 7 figures

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Cited by in corpus (6)

• Phases of correlated spinless fermions on the honeycomb lattice
• Combined topological and Landau order from strong correlations in Chern bands
• Coexistence of distinct charge fluctuations in $\theta$-(BEDT-TTF)${}_2$X
• Symmetry breaking and fermionic fractional Chern insulator in topologically trivial bands
• $d_{x^2-y^2}$-wave density wave and $d_{x^2-y^2}$-wave superconducting gap on the extended Hubbard model on a square lattice
• Density Matrix Renormalization Group study of superconducting pairing near the quarter-filled Wigner crystal