Altermagnetism, featuring momentum-dependent spin splitting without net magnetization, has attracted growing interest for spintronics. We study a Fermi-Hubbard model with altermagnetic order arising from the spin-anisotropic hopping near half filling using constrained-path quantum Monte Carlo. Spin-dependent hopping breaks SU(2) symmetry and disrupts Fermi-surface nesting, giving rise to an altermagnetic state with momentum-space spin splitting but no net magnetization. We find that increasing anisotropy weakens equal-time antiferromagnetic correlations and enhances equal-time connected $d$-wave vertex correlations in the finite systems studied.

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• Altermagnetism
• Superconducting order parameter
• Strongly correlated systems
• Hubbard model
• Quantum Monte Carlo