探测超离子导体中子格子熔化中的非谐振与异质载流子动力学
Probing Anharmonic and Heterogeneous Carrier Dynamics Across Sublattice Melting in a Minimal Model Superionic Conductor
AI总结：
本文研究了超离子导体中子格子熔化和快速离子传输的微观起源，提出了一种化学中性且简化的二元模型，通过分子动力学模拟揭示了三种动力学阶段，并展示了通过调节密度控制子格子熔化的方法，为设计机械稳定的超离子导体提供了统一的微观基础。
摘要：
尽管已有数十年的研究，超离子导体中子格子熔化和快速离子传输的微观起源仍然不清楚。本文引入了一种化学中性且简化的二元模型，由一个由短程立体排斥稳定化的刚性宿主晶格和一个通过长程威根型力相互作用的柔软载流子子晶格组成。这种对比自然产生了不同的熔化温度和一个中间子晶格熔化相，在此相中载流子成为流体状而宿主仍保持晶体状。分子动力学模拟识别出三种动力学阶段——晶体态、子晶格熔化态和完全熔化态，这些阶段通过扩散性、结构相关性和动力学异质性上的明显变化来标记。在接近子晶格熔化时，载流子运动呈现强烈的非谐振性和空间异质性，超出了平均场跃迁描述。通过调节密度，我们证明子晶格熔化可以连续控制，建立了晶格软性、非谐振性和集体离子传输之间的直接联系。与传统长程库仑模型的比较确认了我们的最小模型能够再现超离子性的关键动力学特征，为设计机械稳定的超离子导体提供了统一的微观基础。
英文摘要：
Despite decades of research, the microscopic origin of sublattice melting and fast ion transport in superionic conductors remains elusive. Here, we introduce a chemically neutral minimal binary model consisting of a rigid host lattice stabilized by short-range steric repulsion and a soft carrier sublattice interacting via long-range Wigner-type forces. This contrast naturally produces distinct melting temperatures and an intermediate sublattice-melting phase in which carriers become fluidlike while the host remains crystalline. Molecular dynamics simulations identify three dynamical regimes-crystalline, sublattice-melt, and fully molten-marked by sharp changes in diffusivity, structural correlations, and dynamical heterogeneity. Near sublattice melting, carrier motion is strongly anharmonic and spatially heterogeneous, beyond mean-field hopping descriptions. By tuning the density, we demonstrate that sublattice melting can be continuously controlled, establishing a direct link between lattice softness, anharmonicity, and collective ion transport. Comparison with conventional long-range Coulombic models confirms that our minimal model reproduces the key dynamical signatures of superionicity, providing a unified microscopic foundation for designing mechanically robust superionic conductors.
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