随机钉扎下二维赫兹球结构转变的一种新机制
A new mechanism of structural transition in 2D Hertzian spheres in the presence of random pinning
摘要：
利用分子动力学模拟方法研究了随机钉扎效应对具有Hertz势的二维$α=5/2$体系相图和熔化过程的影响。首次证明了随机钉扎可以从根本上改变不同晶相之间的一级相变机制（三角形和正方形）通过产生六次和四次相：三角形晶体到六方晶的转变是连续Berezinskiii-Kosterlitz-无晶（BKT）型的，六方晶到四方晶的转变是一级的，最后，从四方晶体到四方晶体的连续BKT型转变。
英文摘要：
Using molecular dynamics simulation we have investigated the influence of random pinning on the phase diagram and melting scenarios of a two-dimensional (2D) system with the Hertz potential for $α=5/2$. For the first time it has been shown that random pinning can cardinally change the mechanism of first-order transition between the different crystalline phases (triangular and square) by virtue of generating hexatic and tetratic phases: a triangular crystal to hexatic transition is of the continuous Berezinskii-Kosterlitz-Thouless (BKT) type, a hexatic to tetratic transition is of the first-order, and finally, a continuous BKT type transition from tetratic to the square crystal.
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