单粒子厚条纹熔化中的密度选择拓扑路径
Density-Selected Topological Pathways in the Melting of Single-Particle-Thick Stripes
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中文总结 AI 辅助
该研究通过结合多类可观测量分析二维竞争相互作用模型的分子动力学模拟，发现单粒子厚条纹熔化时，密度可选择其熔化为拓扑不同的流体，拓扑可观测量能区分此类差异。
中文摘要 AI 辅助
形成条纹的系统熔化过程中，连通性发生的变化无法被传统结构和取向描述符完全捕捉。我们研究了一种具有竞争相互作用的二维模型，其低温相由单粒子厚条纹构成。沿7条加热等容线进行的分子动力学模拟，结合热力学、取向、动力学及基于图的可观测量分析。加热引发多阶段重构，其中条纹排列的丧失与细丝连通性的重组发生在不同温度区间。密度决定无序细丝是碎裂为有限类聚合物簇，还是保持连接形成动态流体、系统跨度网络。拓扑可观测量可区分这些结果，而仅靠热力学和取向响应无法分辨。因此，同一有序条纹微相可熔化为密度选择的拓扑上不同的流体。
英文摘要
The melting of stripe-forming systems involves changes in connectivity that are not fully captured by conventional structural and orientational descriptors. We investigate a two-dimensional model with competing interactions whose low-temperature phase consists of one-particle-thick stripes. Molecular dynamics simulations along seven heating isochores are analyzed using thermodynamic, orientational, dynamical, and graph-based observables. Heating produces a multistage reconstruction in which the loss of stripe alignment and the reorganization of filament connectivity occur over distinct temperature ranges. Density controls whether the disordered filaments fragment into finite polymer-like clusters or remain joined in a dynamically fluid, system-spanning network. The topological observables distinguish these outcomes, which are not resolved by the thermodynamic and orientational responses alone. Thus, the same ordered stripe microphase can melt into topologically distinct fluids selected by density.
