ROLE OF INTRA-ADSORBATE COULOMB CORRELATIONS IN ENERGY TRANSFER AT METAL SURFACES
ROLE OF INTRA-ADSORBATE COULOMB CORRELATIONS IN ENERGY TRANSFER AT METAL SURFACES
复制标题
吸附质内库仑相关性在金属表面能量转移中的作用
DOI：
10.1103/physrevb.58.2191
复制
发表时间：
1998
影响因子：
3.7
通讯作者：
D. Langreth
中科院分区：
文献类型：
--
作者：
M. Plihal;D. Langreth
我们提出并讨论了开壳原子或分子吸附物垂直于金属表面移动的电子摩擦理论。该理论适用于吸附质内库仑相互作用将吸附质谱密度中的正离子峰和负离子峰分开的量大于其宽度的情况，并且其中一个比另一个更接近费米能级。我们区分了两个限制：（i）低温摩擦状态，其中摩擦是由吸附物能级宽度和费米能级的重叠引起的，以及（ii）高温摩擦状态，其中摩擦是由热诱导转变引起的。在状态（i）中，我们发现在许多情况下，由于近藤效应，摩擦力大大增强，即使在非常高的温度下也会发生这种效应。在该区域中，摩擦力高度依赖于温度和速度。另一方面，在区域 (ii) 中，我们通常会发现摩擦力比传统理论中的摩擦力有所减少，有时甚至是大幅减少。我们的结果应该适用于热电子引起的解吸的描述，在区域（ii）中被称为 DIMET。
We present and discuss a theory of electronic friction for open-shell atomic or molecular adsorbates moving normal to a metallic surface. The theory applies to the case where the intra-adsorbate Coulomb interaction splits the positive-and negative-ion peaks in the spectral density of the adsorbate by an amount larger than their widths, and where one of them is much nearer the Fermi level than the other. We distinguish two limits:(i) the low-temperature friction regime where the friction is caused by the overlap of the adsorbate level’s width and the Fermi level, and (ii) the high-temperature friction regime, where the friction is caused by thermally induced transitions. In regime (i) we find a large enhancement in the friction in many cases due to the Kondo effect, which can occur even at very high temperatures. In this region, the frictional force is highly temperature and velocity dependent. In region (ii), on the other hand, we typically find a reduction in the friction, sometimes substantial, from what is found in the traditional theory. Our results should be applicable to the description of desorption induced by hot electrons, which has been called DIMET when in region (ii).