Density matrix renormalization group study of superconductivity in the triangular lattice Hubbard model

With the discovery of strong-coupling physics and superconductivity in moiré superlattices, it is essential to have an understanding of strong-coupling driven superconductivity in systems with trigonal symmetry. The simplest lattice model with trigonal symmetry is the triangular lattice Hubbard model. Although the triangular lattice spin model is a heavily studied model in the context of frustration, studies of the hole-doped triangular lattice Hubbard model are rare. Here, we use density matrix renormalization group to investigate the dominant superconducting channels in the hole-doped triangular lattice Hubbard model over a range of repulsive interaction strengths. We find a clear transition from p-wave superconductivity at a moderate on-site repulsion strength (U/t=2) at filling above 1/4 (n∼0.65) to d-wave superconductivity at a strong on-site repulsion strength (U/t=10) at filling below 1/4 (n∼0.4). The unusual tunability that moiré superlattices offer in controlling U/t would open up the opportunity to realize this transition between d-wave and p-wave superconductivity.