标题： 通过增强的晶格涨落在强耦合电荷密度波系统中淬灭电子序 显示英文标题

标题： Quench of the electronic order in a strongly-coupled charge-density-wave system by enhanced lattice fluctuations

摘要： 具有强电子-声子耦合的电荷密度波（CDW）材料为研究晶格涨落与宏观量子序之间的复杂相互作用提供了一个强大的平台。 利用时间分辨和角度分辨光电子能谱（TR-ARPES），我们发现VTe2中的CDW能隙关闭主要由一个在亚皮秒时间尺度上演化的非相干过程主导，这挑战了传统观点，即能隙动力学主要由CDW振幅模的激发所支配。 我们的研究结果得到了一个三温度模型的支持，表明可以通过考虑一组强耦合的光学声子模的布居来描述CDW能隙的演化，这导致晶格涨落的增加。 这一微观框架不仅适用于VTe2，还为理解强耦合CDW系统中的光诱导相变提供了普遍的视角。 显示英文摘要

摘要： Charge-density-wave (CDW) materials having a strong electron-phonon coupling provide a powerful platform for investigating the intricate interplay between lattice fluctuations and a macroscopic quantum order. Using time- and angle-resolved photoemission spectroscopy (TR-ARPES), we reveal that the CDW gap closure in VTe2 is dominated by an incoherent process evolving on a sub-picosecond timescale, challenging the conventional view that the gap dynamics is primarily governed by the excitation of the CDW amplitude modes. Our findings, supported by a three-temperature model, show that the CDW gap evolution can be described by considering the population of a subset of strongly-coupled optical phonon modes, which leads to an increase in the lattice fluctuations. This microscopic framework extends beyond VTe2, offering a universal perspective for understanding the light-induced phase transition in strongly-coupled CDW systems.