论文标题
简单液体中的中范围原子相关。 iii。密度波理论
Medium-Range Atomic Correlation in Simple Liquids. III. Density Wave Theory
论文作者
论文摘要
阐明液体和玻璃的原子结构是凝结物理学中重要的开放问题之一。在常规的自下而上的方法中，一个人首先要关注原子和其相邻原子的短距离顺序，并且通过将原子的本地簇重叠为建筑单位来描述全球结构。但是，这种本地方法无法解释形成中等顺序的强大动力，这本质上与短期顺序不同。我们提出了一种采用额外自上而下方法的公平方案。在自上而下的方法中，一个人从高密度气体状态开始，并试图通过密度波最大程度地减少全球势能。本地自下而上和全球自上而下的驱动力不兼容，它们之间的竞争和妥协导致最终结构中等范围。密度波通过反映原子动力学的相位因子和幅度固定在原子上。这种公平的方法为简单液体和玻璃的结构及其与液体的特性（例如粘度和脆弱性）的关系提供了更直观的解释。
Elucidating the atomic structure of liquid and glass is one of the important open questions in condensed matter physics. In the conventional bottom-up approach one starts with focusing on an atom and the short-range order of its neighboring atoms, and the global structure is described in terms of overlapping local clusters of atoms as building units. However, this local approach fails to explain the strong drive to form the medium-range order which is distinct in nature from the short-range order. We propose an even-handed scheme with an additional top-down approach. In the top-down approach one starts with a high-density gas state and seeks to minimize the global potential energy through density waves. The local bottom-up and global top-down driving forces are not compatible, and the competition and compromise between them result in a final structure with the medium-range order. The density waves are pinned to atoms through the phase factors and amplitudes which reflect atomic dynamics. This even-handed approach provides a more intuitive explanation of the structure of simple liquid and glass and its relation to properties of liquid, such as viscosity and fragility.
