Article (Scientific journals)
Quantitative imaging of electric surface potentials with single-atom sensitivity
Wagner, Christian; Green, Matthew; Maiworm, Michael et al.
2019In Nature Materials, 18, p. 853-859
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Abstract :
[en] Because materials consist of positive nuclei and negative electrons, electric potentials are omnipresent at the atomic scale. However, due to the long range of the Coulomb interaction, large-scale structures completely outshine small ones. This makes the isolation and quantification of the electric potentials that originate from nanoscale objects such as atoms or molecules very challenging. Here we report a non-contact scanning probe technique that addresses this challenge. It exploits a quantum dot sensor and the joint electrostatic screening by tip and surface, thus enabling quantitative surface potential imaging across all relevant length scales down to single atoms. We apply the technique to the characterization of a nanostructured surface, thereby extracting workfunction changes and dipole moments for important reference systems. This authenticates the method as a versatile tool to study the building blocks of materials and devices down to the atomic scale.
Disciplines :
Physics
Author, co-author :
Wagner, Christian
Green, Matthew
Maiworm, Michael
Leinen, Phillip
Esat, Taner
Ferri, Nicola
Friedrich, Niklas
Findeisen, Rolf
Tkatchenko, Alexandre ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Temirov, Ruslan
Tautz, F. Stefan
External co-authors :
yes
Language :
English
Title :
Quantitative imaging of electric surface potentials with single-atom sensitivity
Publication date :
10 June 2019
Journal title :
Nature Materials
ISSN :
1476-4660
Publisher :
Nature Publishing Group, London, United Kingdom
Volume :
18
Pages :
853-859
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 31 October 2019

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