Albrecht, Florian and Fleischmann, Martin and Scheer, Manfred and Gross, Leo and Repp, Jascha (2015) Local tunneling decay length and Kelvin probe force spectroscopy. PHYSICAL REVIEW B, 92 (23): 235443. ISSN 1098-0121, 1550-235X
Full text not available from this repository. (Request a copy)Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BARRIER-HEIGHT; WORK FUNCTION; CHARGE-STATE; MICROSCOPY; MOLECULE; STM; RESOLUTION; SURFACES; DISTANCE; METALS; |
| Subjects: | 500 Science > 530 Physics 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Jascha Repp Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Apr 2019 07:06 |
| Last Modified: | 29 Apr 2019 07:06 |
| URI: | https://pred.uni-regensburg.de/id/eprint/4269 |
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