AI 中文总结
研究铁基磷化物相关哈伯德模型，结合哈特里 - 福克平均场和量子蒙特卡罗方法，揭示由关联诱导的SDW不稳定性驱动的新型条纹有序交变磁绝缘相，其在有限温度稳定，拓展了交变磁性研究领域。
AI 中文摘要
传统上，交变磁性是在共线反铁磁体范式中确定的。它在其他自旋不稳定性（如自旋密度波（SDW））中的潜在实现仍然是一个极具吸引力的基本开放性问题。在此，我们结合哈特里 - 福克平均场和无偏行列式量子蒙特卡罗方法，研究与铁基磷化物相关的最小哈伯德模型。我们揭示了一种由关联诱导的（π,0）SDW不稳定性从根本上驱动的新型dxy波条纹有序交变磁（SOAM）绝缘相。在这个相中，引入的单轴交错电势改变了底层对称性：它打破了原始的时间反演和空间平移对称性（TdT），并保留了时间反演和镜像不变性（MT），从而开启了明显的非相对论自旋分裂。至关重要的是，我们行列式量子蒙特卡罗模拟的精确有限尺寸标度证实，这种关联驱动的SOAM相在可达到的有限温度下稳定存在。我们的研究将交变磁性的前沿从传统反铁磁范式扩展到SDW不稳定性领域，推进了对强关联电子系统中交变磁性的基本理解。
英文摘要
Altermagnetism is conventionally identified within the paradigm of collinear antiferromagnets. Its potential realization within other spin instabilities, such as a spin-density wave (SDW), remains a fundamentally compelling open question. Here, we combine Hartree-Fock mean-field and unbiased determinant quantum Monte Carlo methods to investigate a minimal Hubbard model relevant to iron pnictides. We reveal a novel $d_{xy}$-wave stripe-ordered altermagnetic (SOAM) insulating phase driven fundamentally by the correlation-induced $(π,0)$ SDW instability. Within this phase, an introduced uniaxial staggered electric potential alters the underlying symmetry: it breaks the original combined time-reversal and spatial translation symmetry ($T_{d}\mathcal{T}$) and retains a combined time-reversal and mirror invariance ($M\mathcal{T}$), thereby unlocking the pronounced nonrelativistic spin splitting. Crucially, the exact finite-size scaling from our determinant quantum Monte Carlo simulations confirms that this correlation-driven SOAM phase stably survives at accessible finite temperatures. Our study pushes the frontier of altermagnetism beyond the conventional antiferromagnetic paradigm into the realm of SDW instability, advancing the fundamental understanding of altermagnetism in strongly correlated electron systems.
Comments8+4 pages with 4+3 figures
