Mn$_3$Sn中压磁效应的微观起源：实空间与$ k $空间的双重视角
Microscopic Origin of Piezomagnetism in Mn$_3$Sn: A Dual Real- and $k$-Space Picture
AI总结：
研究通过实空间和动量空间双重分析，揭示Mn$_3$Sn中压磁效应的微观起源，揭示应变诱导费米面特征变化对净磁化的作用机制。
摘要：
我们对非列居磁体Mn$_3$Sn中的压磁效应起源进行了全面的第一性原理研究，该材料以表现出大的异常霍尔效应而闻名。我们研究了应变诱导的电子和磁性态变化，并从实空间和动量空间的角度阐明压磁效应的机制。在实空间中，压磁效应的出现被认为源于特定Mn位点磁矩的旋转，这直接与应变耦合。通过详细的电子结构分析，我们确定了在压磁效应出现中起关键作用的费米面。我们的结果揭示了特定费米面特征在施加应变下经历伪简并解除，这显著贡献于诱导的净磁化。通过结合这些互补的实空间和动量空间视角，我们的双重空间分析为Mn$_3$Sn中应变驱动磁化的微观起源提供了深入见解。
英文摘要：
We present a comprehensive first-principles study on the origin of the piezomagnetic effect in the non-collinear antiferromagnet Mn$_3$Sn, a material known for exhibiting a large anomalous Hall effect. We investigate strain-induced variations of electronic and magnetic states and elucidate the mechanism of the piezomagnetic effect from both real-space and momentum-space perspectives. In real space, the emergence of piezomagnetism is understood to arise from rotations of the magnetic moments at specific Mn sites, which directly couple to the strain. Through detailed electronic structure analysis, we identify the Fermi surfaces that play a crucial role in the emergence of piezomagnetism. Our results reveal that specific Fermi surface features undergo pseudo-degeneracy lifting under applied strain, which significantly contributes to the induced net magnetization. By combining these complementary real-space and momentum-space pictures, our dual-space analysis provides deep insight into the microscopic origins of strain-driven magnetization in Mn$_3$Sn.
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