标题： 声子涨落诊断：AV$_3$Sb$_5$Kagome金属中电荷有序的起源 显示英文标题

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

摘要： AV$_3$Sb$_5$（A = K, Rb, Cs）kagome 金属中电荷密度波（CDW）的微观起源仍然是一个长期存在的问题，通常围绕着电子-声子耦合以及涉及Van Hove情景、巢状结构和亚晶格干扰的纯电子机制展开。 为了揭示驱动CDW转变的过程，我们结合了基于第一性原理计算的声子自能分析和角分辨光电子能谱（ARPES）研究。 我们的动量分辨研究表明，由ARPES数据支持，V-135族kagome金属中的晶格不稳定性似乎也由远离高对称点的电子态驱动，在这些电子态中，它们与导致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订了迄今为止完全归因于费米能级附近巢状效应的CDW形成理论。 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.