标题： V2Se2O中的显著轨道选择性电子-电子关联和电子-声子耦合 显示英文标题

标题： Pronounced orbital-selective electron-electron correlation and electron-phonon coupling in V2Se2O

摘要： 轨道选择性多体效应，其中占据不同轨道的电子经历不同的相互作用强度，在关联多轨道材料中起着关键作用。然而，这些效应通常以复杂的方式表现出来，掩盖了它们的微观起源。在这里，通过结合角分辨光电子能谱测量和理论计算，我们在范德华材料V2Se2O中揭示了电子-电子关联和电子-声子耦合中的显著轨道选择性。电子关联仅在由V d_xy轨道衍生的能带中引起明显的带宽归一化，而主要由其他d轨道组成的能带基本上未被归一化。轨道解析分析表明，填充数和带宽是决定轨道相关性的关键因素。同时，d_(xz/yz)轨道衍生的能带表现出尖锐的kink异常，这是由于与以氧振动为主的高能声子模式的增强耦合所致。这种显著的轨道选择性使V2Se2O成为解开轨道选择性电子-电子和电子-声子相互作用微观机制的罕见且典型的平台，并为设计关联多轨道材料提供了指导原则。 显示英文摘要

摘要： Orbital-selective many-body effects, in which electrons occupying different orbitals experience distinct interaction strengths, play a crucial role in correlated multiorbital materials. However, these effects usually manifest in a complex manner, obscuring their microscopic origins. Here, by combining angle-resolved photoemission spectroscopy measurements with theoretical calculations, we reveal pronounced orbital selectivity in both electron-electron correlation and electron-phonon coupling in the van der Waals material V2Se2O. Electron correlation induces distinct bandwidth renormalization exclusively in the V d_xy-derived band, while the bands mainly composed of the other d orbitals remain essentially unrenormalized. Orbital-resolved analyses identify that the filling number and the bandwidth are decisive factors governing orbital-dependent correlation. Simultaneously, the d_(xz/yz)-derived band exhibits a sharp kink anomaly, arising from enhanced coupling to high-energy phonon modes dominated by oxygen vibrations. Such pronounced orbital selectivity positions V2Se2O as a rare and prototypical platform for unravelling the microscopic mechanisms of orbital-selective electron-electron and electron-phonon interactions, and offers guiding principles for the design of correlated multiorbital materials.