交变磁体中的相移多分量自旋电荷向列性
Phase-shifted multicomponent spin-charge nematicity in an altermagnet
浏览论文内容
中文总结 AI 辅助
研究Co0.25NbSe2中的交变磁体向列性，借助光谱成像和自旋极化扫描隧道显微镜，发现零场下相关方向在电荷与自旋通道失去旋转等效性，有相移自旋电荷向列响应，确立其为新电子液晶序形式，指出交变磁体转变关联相的途径。
中文摘要 AI 辅助
交变磁体具有无净磁化的自旋分裂费米面。这种本质上的多分量电子环境增加了熟悉的关联电子相获得非常规自旋电荷结构的可能性。本文报道了在Co0.25NbSe2中发现交变磁体向列性。利用光谱成像扫描隧道显微镜和自旋极化扫描隧道显微镜，我们发现在零场状态下，三个名义上与C3相关的方向在电荷和自旋敏感隧道通道中失去旋转等效性。引人注目的是，主导的自旋敏感分量相对于主导的电荷分量偏移了一个C3扇区，揭示了相移自旋电荷向列响应。现象学理论表明，交变磁序有利于电荷和自旋敏感向列分量之间的有限相对相位——C3晶格钉扎阻碍了这种优选的偏移并选择了观察到的相位锁定。这些结果将交变磁体向列性确立为一种新的多分量电子液晶序形式，并指出了一条潜在的通用途径，通过该途径交变磁体可以将传统的关联相转变为对称工程化的自旋电荷序。
英文摘要
Altermagnets host spin-split Fermi surfaces without net magnetization. This intrinsically multicomponent electronic setting raises the possibility that familiar correlated electron phases acquire unconventional spin-charge structure. Here we report the discovery of altermagnetic nematicity in Co0.25NbSe2. Using spectroscopic-imaging scanning tunneling microscopy and spin-polarized scanning tunneling microscopy, we find that the three nominally C3-related directions lose rotational equivalence in the zero-field state, in both charge and spin-sensitive tunneling channels. Strikingly, the dominant spin-sensitive component is shifted by one C3 sector relative to the dominant charge component, revealing a phase-shifted spin-charge nematic response. A phenomenological theory shows that altermagnetic order favors a finite relative phase between the charge and spin-sensitive nematic components -- C3 lattice pinning frustrates this preferred offset and selects the observed phase locking. These results establish altermagnetic nematicity as a new form of multicomponent electronic liquid-crystal order and point to a potentially generic route by which altermagnets can transform conventional correlated phases into symmetry-engineered spin-charge orders.
