How a bilayer Nickelate superconducts: a Quantum Monte Carlo study

Abstract

Using determinant Quantum Monte Carlo, we investigate the interplay between doping, inter-layer tunneling and onsite Hund's coupling in stabilizing superconductivity (SC) in a two-orbital model for the bilayer Nickelate $\text{La}_3\text{Ni}_2\text{O}_7$. With realistic dispersion and for certain values of the interaction parameters, the auxiliary-field-decoupled fermion Hamiltonian has Kramers anti-unitary symmetries which guarantee the absence of a sign problem. The same anti-unitary symmetries can also be used to show there is a second instability towards $(\pi,\pi)$ exciton condensation in the strong interaction limit. We indicate the possible connection between this exciton order and the enigmatic density wave state observed in experiment, and clarify the decisive role played by the inter-layer tunneling in the competition between SC and exciton condensation. Finally, possible directions on how to enhance the SC transition temperature and stabilize the SC phase are also discussed.