Symmetry-enabled tunable square-lattice Hubbard models in-valley moir'e bilayers
The study creates a tunable square-lattice Hubbard model using $\Gamma$-valley twisted homobilayers. By applying an external displacement field, researchers can control the ratio of next-nearest-neighbor to nearest-neighbor hopping ($t'/t$). This tunability allows simulation of correlated phenomena relevant to unconventional superconductivity by linking $\Gamma$ and M-valley physics.