在密集液体中出现的结构相关性
Ilian Pihlajamaa1, Corentin C L Laudicina1, Chengjie Luo1,2
1Soft Matter & Biological Physics, Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands.
PNAS nexus
|June 21, 2023
概括
超冷却液体显著改变了它们的四体结构,揭示了复杂的多体相关性,超出了简单的两体相互作用. 了解这些高阶相关性对于准确描述液体行为至关重要.
科学领域:
- 统计物理 统计物理
- 凝聚物质物理学 凝聚物质物理学
- 计算化学计算化学
背景情况:
- 描述密度和超冷液体的结构是统计物理学的一个基本挑战.
- 现有的研究主要研究两体结构相关性,对三体相关性的探索有限.
研究的目的:
- 在密集和超冷液体中量化研究多体静态结构因子.
- 扩展结构分析超越两体和三体相关性,直到六体水平.
主要方法:
- 使用分子动力学模拟提取多体静态结构因子.
- 用密度函数理论推导高达六体水平的结构因子的准确近似值.
主要成果:
- 超冷却显然增加了四体相关性,类似于下级相关性.
- 在超冷却时,在小波数下观察到液体四点结构的显著质量和数量变化.
- 高阶相关性中的这些变化并没有反映在两点结构相关性中.
结论:
- 超出二粒子层次的多体相关性对于完全了解密集液体结构和动态至关重要.
- 观察到的四点结构变化凸显了仅依赖于对互动的理论的局限性.
- 未来的液体结构和动态理论必须结合这些高阶相关性来捕捉复杂的液体行为.
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