Friction coefficient of atoms near a metal surface
Friction coefficient of atoms near a metal surface
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金属表面附近原子的摩擦系数
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
A. Nourtier
中科院分区：
文献类型：
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作者：
A. Nourtier
2014年利用Newns-Anderson哈密顿量计算了原子在金属表面附近运动以及两个相互作用吸附原子的摩擦系数03 B1。在不考虑库仑相互作用的情况下，我们发现可以方便地将03 B1分解为（~v）2和sin ~ 2（~v ~ v ′）项，其中~v ′是费米能级上的广义相移。对于一个原子，03 B1在一个简单的模型中进行了数值计算。澄清了其他作者报道的尖锐最大值的起源。库仑相互作用，然后考虑到，首先在Hartree-Fock近似。后者似乎没有什么价值，特别是在局部磁性的开始附近。在一个原子的情况下，在一个简单的模型中处理，在原子的状态密度的03 B1的精确表达式推导，导致更精确的图片的行为03 B1。最后讨论了电子激发和声子在摩擦中的作用。LE JOURNAL DE PHYSIQUE托姆38，MAI 1977，分类物理文摘9.270
2014 The friction coefficient 03B1 of an atom moving near a metal surface and that of two interacting adatoms is calculated by using a Newns-Anderson hamiltonian. In the absence of Coulomb interaction, it is found convenient to decompose 03B1 into (~~v)2 and sin2 (~v ~v’) terms where the ~v’s are the generalized phase shifts at Fermi level. For one atom, 03B1 is evaluated numerically in a simple model. The origin of the sharp maxima reported by other authors is clarified. The Coulomb interaction is then taken into account, first within the Hartree-Fock approximation. The latter appears to be little valuable, especially near the onset of the localized magnetism. In the case of one atom, treated in a simple model, an exact expression of 03B1 in terms of the density of states at the atom is derived, leading to a more precise picture of the behaviour of 03B1. Finally, the respective role of electronic excitations and phonons in friction is discussed. LE JOURNAL DE PHYSIQUE TOME 38, MAI 1977, Classification Physics Abstracts 9.270