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Journal Article

Observing single-atom diffusion at a molecule-metal interface

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Mielke,  Johannes
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Martínez-Blanco,  Jesus
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Grill,  Leonhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physical Chemistry, University of Graz;

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PhysRevB.94.035416.pdf
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Citation

Mielke, J., Martínez-Blanco, J., Peters, M. V., Hecht, S., & Grill, L. (2016). Observing single-atom diffusion at a molecule-metal interface. Physical Review B, 94(3): 035416. doi:10.1103/PhysRevB.94.035416.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-2E19-A
Abstract
The dynamics at the interface between a close-packed porphyrin monolayer and Au(111) is investigated by time-dependent scanning tunneling microscopy, detecting the motion of single-interface adatoms in real space. Imaging sequences reveal predominant switching of the molecular appearance in adjacent molecules, pointing to a spatial correlation that is consistent with adatom diffusion from one molecule to the next. In some cases, the number of switching molecules is drastically increased, indicating collective switching events. In addition to the thermally induced motion of adatoms at the interface, also voltage pulses from the microscope tip can induce the process—revealing different yields in agreement with the model of adatom hopping.