自序到强加序的尘埃——在MDPX中的连续空间相变实验
Self ordering to imposed ordering of dust -- a continuous spatial phase transition experiment in MDPX
AI总结：
该研究通过MDPX实验展示了尘埃从六重自序到四重强加序的相变，揭示了磁场临界值对尘埃排列的影响。
摘要：
在磁化尘埃等离子体实验（MDPX）中进行的先前实验揭示了一个引人入胜的现象，最初被称为强加序。当微米级的尘埃颗粒在强磁场垂直于网格的情况下，与放置在尘埃上方（距离远大于等离子体德拜长度或离子-中性子或电子-中性子平均自由程）的导电网格的几何形状对齐时就会发生。在本工作中，展示了过渡实验的结果，从无磁场的二维库仑晶体（B=0 T）开始，尘埃过渡到沿其上方导电网格几何形状流动的状态，映射出边界条件的四重对称性。假设在一定磁化程度以上，从网格发出的伸长电势结构驱动尘埃运动，使其反映网格形态，从六重自序转变为四重强加序。各种尘埃相被量化，并在过渡实验中确定了一个磁场临界值，表明强加序的开始。
英文摘要：
Previous experiments conducted in the Magnetized Dusty Plasma eXperiment (MDPX) revealed an intriguing phenomenon first referred to as imposed ordering. This occurs when micron-sized dust particles become aligned with the geometry of a conducting mesh placed above the dust (at a distance much larger than the plasma Debye length or the ion-neutral or electron-neutral mean free paths) in the presence of a strong magnetic field perpendicular to the mesh. In this work, results of a transition experiment are presented wherein starting from a classical two-dimensional Coulomb crystal with hexagonal symmetry in an unmagnetized plasma $(B = 0\,T)$, dust transitions to a state in which it flows along the geometry of a conducting mesh placed above it, mapping out the 4-fold symmetry of the boundary condition. It is hypothesized that beyond a certain magnetization, elongated electric potential structures emanating from the mesh drive the dust motion to reflect the mesh morphology, transitioning from a 6-fold self ordering to 4-fold imposed ordering. The various dust phases are quantified and a critical value of magnetic field is identified in the transition experiment indicating the onset of imposed ordering.
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