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APS » Journals » Phys. Rev. Lett. » Volume 85 » Issue 14
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Phys. Rev. Lett. 85, 2981–2984 (2000)

Substrate Mediated Long-Range Oscillatory Interaction between Adatoms: Cu /Cu(111)

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Jascha Repp1, Francesca Moresco1, Gerhard Meyer1,2, and Karl-Heinz Rieder1
1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
2Paul Drude Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany

Per Hyldgaard and Mats Persson
Department of Applied Physics, Chalmers University of Technology and Göteborgs University, S-41296, Göteborg, Sweden

Received 2 June 2000; published in the issue dated 2 October 2000

See accompanying Physics Focus

A quantitative study of the long-range interaction between single copper adatoms on Cu(111) mediated by the electrons in the two-dimensional surface-state band is presented. The interaction potential was determined by evaluating the distance distribution of two adatoms from a series of scanning tunneling microscopy images taken at temperatures of 9–21 K. The long-range interaction is oscillatory with a period of half the Fermi wavelength and decays for larger distances d as 1/d2. Five potential minima were identified for separations of up to 70 Å. The interaction significantly changes the growth of Cu/Cu(111) at low temperatures.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.2981
DOI:
10.1103/PhysRevLett.85.2981
PACS:
68.35.Fx, 61.16.Ch
 
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