自旋纹理铁磁体中的电导各向异性和线性双折射
Emergent Gauge Fields and Linear Dichroism in Spin-Textured Altermagnets
AI总结：
研究通过自旋纹理在自旋易变磁体中产生强可调的电导各向异性和光学各向异性，揭示了其作为方向选择性电子与光学功能的实现途径。
摘要：
在反铁磁体中，自旋纹理普遍存在，但其对自旋易变磁体（altermagnets）的影响仍鲜有研究。我们展示，Néel序的平滑空间变化对它inerant电子起着涌现的规范场作用，产生强且可调的直流输运和能带光学吸收的平面各向异性，即使没有内在的自旋轨道耦合。作为具体例子，我们分析了共面自旋螺旋，并预测电导率和线性双折射的主轴由螺旋波矢决定。此外，光学各向异性表现出两个不同的频率区域，由临界点分隔：在低频下，吸收轴锁定到晶格轴，而在高频下则跟踪螺旋。我们的结果表明，极化分辨光学和各向异性输运是直接探测纹理自旋易变磁体状态的手段，并建议在自旋易变磁体中实现方向选择性电子和光学功能的简单途径。
英文摘要：
Spin textures are ubiquitous in antiferromagnets, yet their consequences for altermagnets remain largely unexplored. We show that smooth spatial variations of the Néel order act on itinerant electrons as emergent gauge fields that couple to the altermagnetic sublattice-odd channel. For a coplanar spin helix, this channel generates two responses that vanish when it is removed: a momentum-resolved sublattice-odd spectral structure and a net interband linear dichroism whose principal axes are controlled by the helix wave vector, so the optical response can be steered by the magnetic texture. The dichroism exhibits two distinct regimes separated by a crossover: at low frequencies the absorption axis is locked to the crystal axes, while at high frequencies it tracks the helix. Anisotropic dc transport provides a complementary quantitative signature, and all signatures are robust to weak intrinsic spin-orbit coupling. Our results identify polarization-resolved optics and sublattice-sensitive spectroscopy as direct probes of textured altermagnetic states and suggest a route to direction-selective electronic and optical functionality in altermagnets.
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