Electric-Field Control of a Single-Atom Polar Bond.
Phys Rev Lett
; 126(21): 216801, 2021 May 28.
Article
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| MEDLINE
| ID: mdl-34114869
ABSTRACT
We expose the polar covalent bond between a single Au atom terminating the apex of an atomic force microscope tip and a C atom of graphene on SiC(0001) to an external electric field. For one field orientation, the AuâC bond is strong enough to sustain the mechanical load of partially detached graphene, while for the opposite orientation, the bond breaks easily. Calculations based on density-functional theory and nonequilibrium Green's function methods support the experimental observations by unveiling bond forces that reflect the polar character of the bond. Field-induced charge transfer between the atomic orbitals modifies the polarity of the different electronegative reaction partners and the AuâC bond strength.
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MEDLINE
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Phys Rev Lett
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2021
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Article