A complex phase transition in Sri/Ge(111) and similar systems can be decomposed into two intertwined phase transitions: a structural symmetry lowering (root3 x root3) double left right arrow (3x3) transition and a disorder-order transition in the defect distribution, We present two phenomenological models that describe these transitions and their interrelation. These models allow us to understand the formation of domains and domain walls at low temperatures, defect-induced density waves above the structural transition temperature, and ordering of the defects caused by lattice-mediated defect-defect interactions. The models predict a destruction of the pure structural transition when impurities are introduced into the system, a shift in the structural crossover temperature with impurity density. and a dependence of the (3x3) lattice structure on the specific defect alignment.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据