Step capillary waves and equilibrium island shapes on Si(001).
Step capillary waves and equilibrium island shapes on Si(001).
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DOI：
10.1103/physrevlett.73.1656
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发表时间：
1994-09
影响因子：
8.6
通讯作者：
Bartelt;Tromp;Williams
中科院分区：
文献类型：
--
作者：
Bartelt;Tromp;Williams
根据低能电子显微镜测量的台阶涨落和平衡二维岛的形状，我们确定了S A和S B的台阶边缘硬度、自由能和迁移率与温度的关系。台阶刚度的毛细波分析与二维岛的形状定量一致，证明了平衡热涨落与平衡结构之间的直接关系。分析还表明，在∼1200C时，自由台阶能消失，这为粗化转变提供了直接证据。阶跃动力学和平衡岛形的结合探索使我们对Si(001)的基本热力学有了新的认识。
From low-energy electron microscopy measurements of step fluctuations and equilibrium 2D island shapes on Si (001), We determine the temperature dependence of the S A and S B step edge stiffnesses, free energies, and mobilities. A capillary wave analysis of step stiffnesses is in quantitative agreement with the 2D island shapes, demonstrating the direct relation between equilibrium thermal fluctuations and equilibrium structure. The analysis also suggests that step free energies vanish at∼ 1200 C, providing direct evidence for a roughening transition. The combined exploration of step dynamics and equilibrium island shapes yields new insight into the basic thermodynamics of Si (001).