标题： 声子涨落诊断：AV$_3$Sb$_5$三角格子金属中电荷序的起源 显示英文标题

标题： Phonon fluctuation diagnostics: Origin of charge order in AV$_3$Sb$_5$ kagome metals

摘要： 电荷密度波（CDW）在AV$_3$Sb$_5$（A = K, Rb, Cs）kagome金属中的微观起源仍然是一个长期存在的问题，通常围绕电子-声子耦合和纯粹的电子机制，涉及Van Hove情景、嵌套和亚晶格干扰。为了揭示驱动CDW转变的过程，我们将第一性原理计算分析声子自能和角分辨光电子能谱（ARPES）结合在一起。我们的动量分辨研究，得到了ARPES数据的支持，揭示了kagome金属V-135族中的晶格不稳定性似乎也由远离高对称点的电子态驱动，这些态与导致CDW畸变的声子模式表现出最强的耦合。基于声子涨落诊断的解释方案，我们的工作挑战并修正了迄今为止仅将CDW形成归因于费米面附近嵌套效应的理论。 显示英文摘要

摘要： The microsopic origin of the charge-density wave (CDW) in AV$_3$Sb$_5$ (A = K, Rb, Cs) kagome metals remains a longstanding question, often revolving around electron-phonon coupling and purely electronic mechanisms involving Van Hove scenarios, nesting, and sublattice interference. To reveal the processes driving the CDW transition, we combine ab-initio calculations analysis of the phonon self-energy and angle-resolved photoemission spectroscopy (ARPES). Our momentum-resolved study, supported by ARPES data, reveals that lattice instabilities in the V-135 family of kagome metals appear to also be driven by electronic states far from high-symmetry points, where these states exhibit the strongest coupling with the phonon modes responsible for the CDW distortion. Footing on an interpretation scheme based on phonon fluctuation diagnostics, our work challenges and revises theories that so far have exclusively attributed CDW formation to nesting effects close to the Fermi level.