Stability and dynamic of strain mediated adatom superlattices on Cu<111>

被引:0
|
作者
Kappus, Wolfgang
机构
关键词
Strain mediated interactions; Short range interactions; Adatom density distribution; Stability and dynamic of superlattices; Cu(111) surface; Collective adatom diffusion modes; Coverage and temperature dependence; Dispersion relation of longitudinal and; transversal diffusion modes; SUBSTRATE; SURFACE;
D O I
10.1016/j.susc.2012.10.007
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Substrate strain mediated adatom equilibrium density distributions have been calculated for Cu < 111 > surfaces using two complementing methods. A hexagonal adatom superlattice in a coverage range up to 0.045 NIL is derived for repulsive short range interactions. For zero short range interactions a hexagonal superstructure of adatom clusters is derived in a coverage range about 0.08 ML Conditions for the stability of the superlattice against formation of dimers or clusters and degradation are analyzed using simple neighborhood models. Such models are also used to investigate the dynamic of adatoms within their superlattice neighborhood. Collective modes of adatom diffusion are proposed from the analogy with bulk lattice dynamics and methods for measurement are suggested. The recently put forward explanation of surface state mediated interactions for superstructures found in scanning tunneling microscopy experiments is put in question and strain mediated interactions are proposed as an alternative. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:30 / 38
页数:9
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