In one-dimensional (1D) metallic systems, the diverging electron susceptibility and electron-phonon coupling collaboratively drive the electrons into a charge density wave (CDW) state. However, a strictly 1D system is unstable against perturbations, whose effect on CDW order requires clarification ideally with altered coupling to surroundings. Here, we fabricate such a system with nanowires of ${\mathrm{Mo}}_6{\mathrm{Se}}_6$ bundles, which are either attached to edges of monolayer ${\mathrm{MoSe}}_2$ or isolated freely, by postannealing the preformed ${\mathrm{MoSe}}_2$. Using scanning tunneling microscopy, we visualize charge modulations and CDW gaps with prominent coherent peaks in the edge-attached nanowires. Astonishingly, the CDW order becomes suppressed in the isolated nanowires, showing CDW correlation gaps without coherent peaks. The contrasting behavior, as revealed with theoretical modeling, is interpreted as the effect of phason polarons on the 1D CDW state. Our work elucidates a possibly unprecedented many-body effect that may be generic to strictly 1D system but undermined in a quasi-1D system.

中文翻译：

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可能的Phason-Polaron效应对Mo6Se6纳米线的纯一维电荷阶数的影响

在一维（1D）金属系统中，发散的电子敏感性和电子-声子耦合共同驱动电子进入电荷密度波（CDW）状态。但是，严格的一维系统对于扰动是不稳定的，理想情况下，其对CDW顺序的影响需要通过改变与环境的耦合来进行澄清。在这里，我们用纳米线${莫}_6{硒}_6$ 束，它们附着在单层的边缘 ${\mathrm{钼硒}}_2$ 或自由隔离，通过对预制件进行后退火 ${\mathrm{钼硒}}_2$。使用扫描隧道显微镜，我们可以观察到在边缘附着的纳米线中电荷调制和CDW间隙具有突出的相干峰。令人惊讶的是，CDW顺序在孤立的纳米线中被抑制，显示出CDW相关间隙而没有相干峰。如理论模型所揭示的，相反的行为被解释为声子极化子对一维CDW状态的影响。我们的工作阐明了可能是前所未有的多体效应，这种效应对于严格的一维系统可能是通用的，但在准一维系统中却被削弱了。