Department of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius Väg. 16C, S-10691 Stockholm, Sweden.
International Computer Science Institute, 1947 Center St., Berkeley, California 94704, USA.
Phys Rev E. 2018 May;97(5-1):052702. doi: 10.1103/PhysRevE.97.052702.
The hexatic phase predicted by the theories of two-dimensional melting is characterized by the power-law decay of the orientational correlations, whereas the in-layer bond orientational order in all the hexatic smectic phases observed so far was found to be long range. We report a hexatic smectic phase where the in-layer bond orientational correlations decay algebraically, in quantitative agreement with the hexatic ordering predicted by the theory for two dimensions. The phase was formed in a molecular dynamics simulation of a one-component system of particles interacting via a spherically symmetric potential. The present results thus demonstrate that the theoretically predicted two-dimensional hexatic order can exist in a three-dimensional system.
由二维熔化理论预测的六方相的特征在于取向关联的幂律衰减，而迄今为止观察到的所有六方向列相的层内键取向有序性都被发现是长程的。我们报告了一种六方向列相，其中层内键取向关联按代数方式衰减，与二维理论预测的六方有序性定量一致。该相是在通过球对称势相互作用的单组分粒子的分子动力学模拟中形成的。因此，目前的结果表明，理论预测的二维六方有序可以存在于三维系统中。
