Origin of superconductivity in bilayer nickelates: a Quantum Monte Carlo study for a sign-problem-free effective model
Researchers used Determinant Quantum Monte Carlo simulations on a simplified model of bilayer Nickelate La3Ni2O7 to study superconductivity. They found a superconducting phase with a low transition temperature ($T_c \lesssim 0.06$) arising from the $dx^2-y^2$ orbital interaction. The study highlights competition between superconducting and exciton condensation instabilities, suggesting that exciton condensation at $(\pi, \pi)$ might be related to experimental density waves.