AI 中文总结
本研究采用量子电动力学密度泛函理论，发现面外偏振单模腔可调控笼目金属CsV₃Sb₅中CDW与超导电性的相互作用，抵消压力对CDW声子的硬化、增强高压区电声耦合并提高超导T_c，为笼目材料的相关序调控提供新途径。
AI 中文摘要
笼目金属存在相互竞争的电子序，包括电荷密度波（CDW）序和超导电性，其由相互交织的晶格、电子关联及笼目几何效应塑造。本文采用量子电动力学密度泛函理论，在笼目金属CsV₃Sb₅中确定了一种平衡腔调控途径，以重塑该平衡。面外偏振单模腔可选择性软化CDW相关声子，抵消压力诱导的硬化作用，并将CDW不稳定性延伸至更高压力区域。在高压区域（若无腔耦合CDW不稳定性会被抑制），腔耦合会将Eliashberg谱权重重新分布至更低频率，增强总电声耦合（EPC），并提高基于EPC的Allen-Dynes T_c估计值。该响应源于面外光子模式诱导的电荷重新分布，其改变晶格恢复力并驱动声子与EPC重整化。这些结果表明，腔量子电动力学是调控笼目材料中相互交织的电荷序、晶格动力学及超导电性的可行平衡途径。
英文摘要
Kagome metals host competing electronic orders, including charge-density-wave (CDW) order and superconductivity, shaped by intertwined lattice, electronic-correlation, and kagome-geometric effects. Here, using quantum electrodynamical density functional theory, we identify an equilibrium cavity route for reshaping this balance in the kagome metal CsV$_3$Sb$_5$. An out-of-plane polarized single-mode cavity selectively softens CDW-related phonons, counteracting pressure-induced hardening and extending the CDW instability toward higher pressures. In the high-pressure regime where the CDW instability is otherwise suppressed, cavity coupling redistributes Eliashberg spectral weight toward lower frequencies, enhances the total electron--phonon coupling (EPC), and increases the EPC-based Allen--Dynes estimate of $T_c$. This response originates from a charge-density redistribution induced by the out-of-plane photon mode, which modifies lattice restoring forces and drives the phonon and EPC renormalization. These results establish cavity quantum electrodynamics as a viable equilibrium route for tuning intertwined charge order, lattice dynamics, and superconductivity in kagome materials.
Comments14 pages, 8 figures, including Supplemental Material
