Real-time imaging of K atoms on graphite: interactions and diffusion |
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Authors: | Renard J Lundeberg M B Folk J A Pennec Y |
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Institution: | Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T1Z4, Canada. renardj@phas.ubc.ca |
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Abstract: | Scanning tunneling microscopy (STM) at liquid helium temperature is used to image potassium adsorbed on graphite at low coverage (≈0.02 monolayer). Single atoms appear as protrusions on STM topographs. A statistical analysis of the position of the atoms demonstrates repulsion between adsorbates, which is quantified by comparison with molecular dynamics simulations. This gives access to the dipole moment of a single adsorbate, found to be 10.5±1 D. Time-lapse imaging shows that long-range order is broken by thermally activated diffusion, with a 30 meV barrier to hopping between graphite lattice sites. |
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