Dresden 2014 – wissenschaftliches Programm

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SYOM: Symposium One-dimensional Metals: Reality or Fiction

SYOM 2: Posters: One-Dimensional Metals: Reality or Fiction (jointly organized by DS, HL, O, TT)

SYOM 2.5: Poster

Donnerstag, 3. April 2014, 16:00–19:00, P1

Pb nanowires on Si(557) — •Frederic Timmer¹, Sebastian Gevers¹, Thomas Weisemöller¹, Christoph Tegenkamp², and Joachim Wollschläger¹ — ¹Fachbereich Physik, Universität Osnabrück, Barbarastr. 7, 49076 Osnabrück — ²Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover

The restructuring of the Si(557) surface during formation of Pb nanowires has been investigated in-situ by surface x-ray diffraction (SXRD) studies which were performed at the beamline ID03 of ESRF. For this purpose, Pb has been deposited on the bare Si(557) - (3×1) at room temperature until 3D Pb islands were grown on the initial Pb wetting layer. The formation of Pb islands was monitored by the appearance of 3D Pb Bragg peaks.

Thereafter, Pb was carefully desorbed by annealing to 600K. This process was controlled by recording corresponding 3D Pb Bragg peaks directly in-situ by SXRD. Desorption of Pb has been stopped when the Pb islands have vanished and the Pb wetting layer is transformed into a (√3×√3) superstructure on the nano-(111) terraces of the Si(557) surfaces. Reciprocal space mappings were recorded in the [7,7,10] direction, i.e. perpendicular to the atomic steps, clearly indicating a strong refacetting of the initial (557) orientation. It turns out that the restructured Si(557) surface is indeed stabilized by the (√3×√3) Pb overlayer on the Si(111) terraces.