We demonstrate that the infinite-$U$ triangular-lattice Hubbard model supports a superconducting state built from tightly bound Cooper pairs composed of two holes and one magnon ($2h1m$). Building on the seminal prediction of repulsively bound $2h1m$ states, we show that next-nearest-neighbor hopping $t_2$ coherently mixes symmetry-related configurations, stabilizing an $s$-wave bound state with substantial binding energy and a light effective mass. Large-scale density matrix renormalization group calculations at finite doping reveal, over a finite magnetic-field window, a magnetization plateau with one magnon per pair of doped holes and quasi-long-range superconducting order characterized by algebraically decaying $2h1m$ correlations. Our results establish a kinetically driven superconducting phase of composite magnonic Cooper pairs and provide directly measurable signatures for moiré Hubbard materials and ultracold-atom simulators.

Close

PrevNext

View figure in article

• Pairing mechanisms
• Superconductivity
• Hubbard model