Soft Condensed Matter, Debye Institute for NanoMaterials Science, Utrecht University, Princetonplein 5, 3584 CC, Utrecht, The Netherlands.
Phys Rev Lett. 2009 Dec 11;103(24):248304. doi: 10.1103/PhysRevLett.103.248304. Epub 2009 Dec 9.
Using simulations of hard rods in smectic-A states, we find stringlike clusters of up to 10 interlayer rods exhibiting dynamic cooperativity. We also find non-gaussian diffusion and heterogeneous dynamics due to the equilibrium periodic smectic density profiles, which give rise to permanent barriers for layer-to-layer diffusion. This relaxation behavior is surprisingly similar to that of nonequilibrium supercooled liquids, although there the particles are trapped in transient (instead of permanent) cages.
利用硬棒在近晶 A 态中的模拟，我们发现多达 10 根层间棒的串状簇表现出动态协同性。我们还发现由于平衡周期性近晶密度分布导致的非高斯扩散和非均匀动力学，这为层间扩散产生了永久障碍。这种弛豫行为与非平衡过冷液体非常相似，尽管在非平衡过冷液体中，粒子被困在瞬态（而不是永久）笼中。
