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On melting criteria for complex plasma

机译：关于复杂血浆的熔化标准

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摘要

The present paper considers melting criteria for a plasma crystal discovered in dust plasma in 1994. Separate discussions are devoted to three-dimensional (3D) and two-dimensional (2D) systems. In the 3D case, melting criteria are derived based on the properties of local order in a system of microparticles. The order parameters are constructed from the cumulative distributions of the microparticle probability distri-butions as functions of various rotational invariants. The melt-ing criteria proposed are constructed using static information on microparticle positions: a few snapshots of the system that allow for the determination of particle coordinates are enough to determine the phase state of the system. It is shown that criteria obtained in this way describe well the melting and premelting of 3D complex plasmas. In 2D systems, a system of microparticles interacting via a screened Coulomb (i.e., Debye—Huckel or Yukawa) potential is considered as an example, using molecu-lar dynamics simulations. A number of new order parameters characterizing the melting of 2D complex plasmas are proposed. The order parameters and melting criteria proposed for 2D and 3D complex plasmas can be applied to other systems as well.
机译：本文考虑了1994年在尘埃等离子体中发现的等离子体晶体的熔化标准。分别讨论了三维（3D）和二维（2D）系统。在3D情况下，熔化标准是根据微粒系统中局部顺序的属性得出的。由作为各种旋转不变量的函数的微粒概率分布的累积分布来构造有序参数。所提出的熔化标准是使用有关微粒位置的静态信息构建的：允许确定微粒坐标的系统快照足以确定系统的相态。结果表明，以这种方式获得的标准很好地描述了3D复杂等离子体的熔化和预熔化。在2D系统中，使用分子动力学模拟，将一个通过筛选的库仑（即，德拜-哈克尔或汤川）电势相互作用的微粒系统作为示例。提出了表征2D复杂等离子体熔化的许多新阶参数。为2D和3D复杂等离子体提出的订购参数和熔化标准也可以应用于其他系统。

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