AI 中文总结
研究利用相分辨扫描隧道显微镜，在d波交替磁体中发现对称驱动的有限q电荷序级联，通过密度波不稳定性驱动电子重构，建立耦合密度波不稳定性层次结构，为相关量子材料多体状态提供新视角。
AI 中文摘要
交替磁体具有磁补偿和非相对论性自旋分裂能带，这种共存由晶体对称性实现。然而，晶体对称性如何组织集体电子序仍 largely 未被探索。本文利用相分辨扫描隧道显微镜，在d波交替磁体Rb$_{1 - \delta}$V$_2$Te$_2$O中发现了有限q电荷序的对称驱动级联。一个主要的密度波不稳定性驱动初始电子重构，随后出现向列分量和与先前序几何相关的波矢的离轴调制。相分辨光谱通过不同的对比度反转能量区分这些分量，并绘制出离轴模式内的分支选择性光谱权重重新分布。这些观察结果与掺杂和温度演化一起，建立了耦合密度波不稳定性的高度协调层次结构，与连续对称性降低一致。这种多分量层次结构可以在朗道框架中通过电荷序的顺序软化很好地描述，其中在低对称阶段与兼容的八极伙伴的双线性耦合在交织的电荷 - 多极态内实现相互稳定。这种电荷序级联的透明实现展示了交替磁对称如何超越能带形成来组织集体电子序，为相关量子材料中涌现的多体状态提供了新视角。
英文摘要
Altermagnets host magnetic compensation together with non-relativistic spin-split bands, a coexistence enabled by crystal symmetry. Yet whether and how crystal symmetry organizes collective electronic order remains largely unexplored. Here we uncover a symmetry-driven cascade of finite-$q$ charge order in a $d$-wave altermagnet Rb$_{1-δ}$V$_2$Te$_2$O, using phase-resolved scanning tunneling microscopy. A primary density-wave instability drives an initial electronic reconstruction, followed by the emergence of a nematic component and an off-axis modulation with wave vectors geometrically tied to the preceding orders. Phase-resolved spectroscopy distinguishes these components through separate contrast-inversion energies and maps out branch-selective spectral-weight redistribution within the off-axis mode. Together with doping and temperature evolution, these observations establish a highly coordinated hierarchy of coupled density-wave instabilities, consistent with successive symmetry lowering. This multi-component hierarchy can be well described in the Landau framework through sequential softening of the charge orders, where bilinear coupling to their compatible octupolar partners at the lower-symmetry stages enables mutual stabilization within an intertwined charge-multipole state. Such a transparent realization of a charge-order cascade shows how altermagnetic symmetry can extend beyond band formation to organize collective electronic order, offering a new perspective on emergent many-body states in correlated quantum materials.
Comments26 pages, 11 figures. Comments are welcome
