Atomic superlattice formation mechanism revealed by scanning tunneling microscopy and kinetic Monte Carlo simulations
Atomic superlattice formation mechanism revealed by scanning tunneling microscopy and kinetic Monte Carlo simulations
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通过扫描隧道显微镜和动力学蒙特卡罗模拟揭示原子超晶格形成机制
DOI:
10.1103/physrevb.81.125438
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发表时间:
2010-03
影响因子:
3.7
通讯作者:
X. P. Zhang
中科院分区:
文献类型:
--
作者:
J. Kirschner;B. F. Miao;H. F. Ding;L. Sun;A. Hu;C. L. Gao;X. P. Zhang
We study the interaction of single Fe atoms on Cu 111 and Ag 111 substrates with low-temperature scanning tunneling microscopy and kinetic Monte Carlo simulations. In Fe/Cu 111 , a self-assembled hexagonal quasisuperlattice with perturbation of around 20% dimers/clusters is obtained. In Fe/Ag 111 , however, a disorderlike structure is found even though long-range interactions among atoms are observed. In combination with kinetic Monte Carlo simulations, possible mechanisms of the superstructure formation are discussed. We find that two parameters, i.e., the ratio of adatom interaction energy the depth of the first energy minimum to diffusion barrier and the square of the repulsive ring radius versus the superstructure lattice constant, play important roles for superstructure formation.
DOI:
10.1142/9781860948053_0009
发表时间:
2006-05
期刊:
--
影响因子:
--
作者:
H. Brune
通讯作者:
H. Brune