Local tunneling decay length and Kelvin probe force spectroscopy
Local tunneling decay length and Kelvin probe force spectroscopy
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局部隧道衰减长度和开尔文探针力谱
DOI：
10.1103/physrevb.92.235443
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发表时间：
2015
影响因子：
3.7
通讯作者：
J. Repp
中科院分区：
文献类型：
--
作者：
F. Albrecht;M. Fleischmann;M. Scheer;L. Gross;J. Repp
过去，电流距离光谱学已被广泛应用于确定表面功函数的变化。虽然对于均匀的样品区域，这种技术被普遍接受，至少可以产生定性的结果，但它对原子尺度变化的适用性还没有被证明是对还是错。在这里，我们对四种明显不同的局部接触电位原子尺度变化情况下的电流距离衰减常数进行了基准测量，并与已建立的开尔文探针力谱进行了比较。这两种技术产生了截然不同的结果。虽然电流距离衰减常数的图与地形伪影一致，但开尔文探针力谱图显示局部接触电位差的变化与预期的表面偶极子一致。这一比较表明，电流距离衰减常数的图不适合直接表征原子长度尺度表面上的接触电位变化。
In the past, current-distance spectroscopy has been widely applied to determine variations of the work function at surfaces. While for homogeneous sample areas this technique is commonly accepted to yield at least qualitative results, its applicability to atomic-scale variations has not been proven neither right nor wrong. Here we benchmark measurements of the current-distance decay constant against the well established Kelvin probe force spectroscopy for four distinctly different cases with atomic-scale variations of the local contact potential. The two techniques yield quite different results. Whereas the maps of the current-distance decay constant are consistent with being topographical artifacts, the Kelvin probe force spectroscopy maps show variations of the local contact potential difference in agreement with expected surface dipoles. This comparison clarifies that maps of the current-distance decay constant are not suited to directly characterize contact potential variations at surfaces on atomic length scales.
DOI：
--
发表时间：
2006
期刊：
--
影响因子：
--
作者：
Iroon Polytechniou-
通讯作者：
Iroon Polytechniou-