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Atom transfer and single-adatom contacts.

L Limot1, J Kröger, R Berndt

  • 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.

Physical Review Letters
|May 21, 2005
PubMed
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Investigating tip-surface interactions reveals a random, one-atom contact formation with silver and copper surfaces. This differs from smooth conductance transitions over adatoms due to dipolar bonding.

Area of Science:

  • Surface Science
  • Scanning Probe Microscopy
  • Condensed Matter Physics

Background:

  • Understanding tip-surface interactions is crucial for atomic-scale manipulation and characterization.
  • Previous studies have explored tunneling to contact transitions, but the precise mechanism of initial contact formation remains debated.

Purpose of the Study:

  • To investigate the atomic mechanisms governing the transition from tunneling to point contact between a scanning tunneling microscope tip and metal surfaces.
  • To differentiate the contact formation process on extended surfaces versus individual adatoms.

Main Methods:

  • Low-temperature scanning tunneling microscopy (LT-STM) was employed to probe tip-surface interactions.
  • Conductance measurements during tip approach were analyzed.

Related Experiment Videos

  • Numerical simulations were performed to model the observed phenomena.

    • Main Results:

    • A sharp, random jump in conductance was observed upon initial tip contact with Ag(111) and Cu(111) surfaces.
    • Tip-apex atom transfer to the surface indicated the formation of a single-atom contact.
    • In contrast, conductance over silver and copper adatoms showed a smooth, reproducible transition.
    • Numerical simulations attributed the difference to additional dipolar bonding between adatoms and surface atoms.

    Conclusions:

    • The formation of point contact with extended metal surfaces is a stochastic process involving single-atom contact.
    • The presence of adatoms alters the contact dynamics, leading to smoother transitions due to modified bonding.
    • This study provides critical insights into the fundamental physics of atomic-scale contacts.