Motivated by recent angle-resolved photoemission spectroscopy (ARPES) experiments on infinite-layer (IL) nickelates, we employ determinant quantum Monte Carlo (DQMC) to study the three-orbital Emery model ($d\text{−}p$ model) coupled to an additional interstitial $s$ orbital that retains the three-dimensional dispersion. Our large-scale simulations reveal that: (1) the interstitial $s$-orbital-derived electron pocket is significantly reduced by strong interactions but persists upon 20% hole doping, reaching a size comparable to experimental observations; (2) the $d_{x^2-y^2}$-orbital dispersion is strongly renormalized by interactions, leading to a weak $k_z$ dependence consistent with ARPES measurements. Furthermore, compared with the conventional three-orbital $d\text{−}p$ model, the $d\text{−}p\text{−}s$ model exhibits enhanced short-range antiferromagnetic correlations. These results highlight the crucial role of strong correlations and multiorbital effects in shaping the low-energy electronic structure and many-body correlations in IL nickelates and demonstrate the necessity of treating interaction-driven many-body physics within a realistic multiorbital framework.

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• Density of states
• Magnetic susceptibility
• High-temperature superconductors
• Nickelates
• Strongly correlated systems
• Many-body techniques
• Quantum Monte Carlo