Subatomic Features on the Silicon (111)-(7x7) Surface Observed by Atomic Force Microscopy |
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Authors: | Giessibl Hembacher Bielefeldt Mannhart |
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Affiliation: | Experimentalphysik VI, Center for Electronic Correlations and Magnetism (EKM), Institute of Physics, University of Augsburg, 86135 Augsburg, Germany. |
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Abstract: | The atomic force microscope images surfaces by sensing the forces between a sharp tip and a sample. If the tip-sample interaction is dominated by short-range forces due to the formation of covalent bonds, the image of an individual atom should reflect the angular symmetry of the interaction. Here, we report on a distinct substructure in the images of individual adatoms on silicon (111)-(7x7), two crescents with a spherical envelope. The crescents are interpreted as images of two atomic orbitals of the front atom of the tip. Key for the observation of these subatomic features is a force-detection scheme with superior noise performance and enhanced sensitivity to short-range forces. |
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