Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 39: Nanostrukturen (II)

O 39.4: Vortrag

Freitag, 15. März 2002, 12:00–12:15, H44

Quantum interference and long-range interaction between adatoms on Cu(111) — •Valeri S. Stepanyuk^1,2, Artem N. Baranov¹, Wolfram Hergert², Patrick Bruno ¹, Nikolaus Knorr³, Alexander Schneider³, and Klaus Kern ³ — ¹MPI f. Mikrostrukturphysik, Weinberg 2, D-06120 Halle — ²Fachbereich Physik, Martin-Luther Universität, Friedemann-Bach Platz 6, D-06099 Halle — ³MPI f. Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart

The scattering of surface state electrons by the Co and the Cu adatoms on Cu(111) surface is studied by means of ab initio multiple-scattering KKR Green’s function method. The quantum interference between incident and scattered surface state electrons leads to standing waves in the electronic density around adatoms. Calculations resolve the lateral oscillations of the local density of states with a wavelength expected from the surface state band structure. Substrate-mediated long-range oscillatory interaction between adatoms is determined using Lloyd’s formula and the frozen potential approximation. Experimentally the direct observation of long-range interaction between adatoms up to 60 Angstrom distance is performed using pair correlations of diffusing adatoms recorded with a low temperature STM. The measured long-range interaction energies are in very good agreement with ab initio calculations.