Khali Shubhendu Shekhar, Chakraborty Dipanjan, Chaudhuri Debasish
Department of Physical Science, Indian Institute Of Science Education and Research Mohali, Punjab 140306, India.
Soft Matter. 2021 Mar 28;17(12):3473-3485. doi: 10.1039/d0sm01484b. Epub 2021 Mar 3.
We present a detailed numerical simulation study of a two-dimensional system of particles interacting via the Weeks-Chandler-Anderson potential, the repulsive part of the Lennard-Jones potential. With the reduction of density, the system shows a two-step melting: a continuous melting of solid to hexatic phase, followed by a first-order melting of hexatic to liquid. The solid-hexatic melting is consistent with the Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young (BKTHNY) scenario and shows dislocation unbinding. The first-order melting of the hexatic to the liquid phase, on the other hand, displays defect-strings formed at the hexatic-liquid interfaces. We present a detailed phase diagram in the density-temperature plane.
我们展示了一个二维粒子系统的详细数值模拟研究，该系统通过威克斯 - 钱德勒 - 安德森势（即 Lennard - 琼斯势的排斥部分）相互作用。随着密度降低，系统呈现出两步熔化过程：从固体到六方相的连续熔化，随后是从六方相到液相的一级熔化。固 - 六方熔化符合贝雷津斯基 - 科斯特利茨 - 索利斯 - 哈珀林 - 尼尔森 - 杨（BKTHNY）情景，并显示出位错解离。另一方面，从六方相到液相的一级熔化在六方 - 液界面处显示出形成的缺陷弦。我们给出了密度 - 温度平面上的详细相图。
