Thorneywork Alice L, Abbott Joshua L, Aarts Dirk G A L, Dullens Roel P A
Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom.
Phys Rev Lett. 2017 Apr 14;118(15):158001. doi: 10.1103/PhysRevLett.118.158001. Epub 2017 Apr 10.
We study the melting of quasi-two-dimensional colloidal hard spheres by considering a tilted monolayer of particles in sedimentation-diffusion equilibrium. In particular, we measure the equation of state from the density profiles and use time-dependent and height-resolved correlation functions to identify the liquid, hexatic, and crystal phases. We find that the liquid-hexatic transition is first order and that the hexatic-crystal transition is continuous. Furthermore, we directly measure the width of the liquid-hexatic coexistence gap from the fluctuations of the corresponding interface, and thereby experimentally establish the full phase behavior of hard disks.
我们通过考虑处于沉降 - 扩散平衡的倾斜单层粒子来研究准二维胶体硬球的熔化。具体而言，我们从密度分布测量状态方程，并使用与时间相关且具有高度分辨率的关联函数来识别液相、六方相和晶相。我们发现液 - 六方转变是一级的，而六方 - 晶相转变是连续的。此外，我们直接从相应界面的涨落测量液 - 六方共存间隙的宽度，从而通过实验确定了硬磁盘的完整相行为。
