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
期刊:
影响因子:
3.7
通讯作者:
X. P. Zhang
X. P. Zhang
中科院分区:
物理与天体物理2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

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我们用低温扫描隧道显微镜和动力学蒙特卡罗模拟研究了单个Fe原子在Cu111和Ag111衬底上的相互作用。在Fe/Cu111中,获得了二聚体/团簇微扰约20%的自组装六方准超晶格。然而,在Fe/Ag111中,即使观察到原子之间的长程相互作用,也发现了类似无序的结构。结合动力学蒙特卡罗模拟,讨论了超结构形成的可能机制。我们发现,吸附原子相互作用能比、第一能量极小值与扩散势垒的深度和排斥环半径与超结构晶格常数的平方这两个参数对超结构的形成起着重要作用。
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