Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.65: Poster

Dienstag, 15. März 2011, 18:30–22:00, P4

Na adsorption on In/Si(111)-(4x1) nanowires: electron transport and structural properties — •Martin Babilon, Christian Thierfelder, Stefan Wippermann, and Wolf Gero Schmidt — Theoretische Physik, Universität Paderborn, 33098 Paderborn, Germany

Quasi one-dimensional structures, such as artificial atomic-scale wires, have attracted considerable attention recently [1,2]. They do not only show fascinating physical properties, but also have a large technological potential, e.g., as atomic-scale interconnects. Highly anisotropic surface superstructures are suitable model systems to explore atomic- scale wires both experimentally and computationally. The In/Si(111)- (4x1) surface [3] is probably the most intensively investigated system in this context. Here we present first-principles calculations on the adsorption geometries and the influence of Na adatoms on the Landauer conductance of these In nanowires. Our findings with regard to structural properties confirm the results by Kleinman et al. [4]. Additionally, we discuss the implications of the Na adatoms on the temperature induced (4x1) -> (8x2) phase transition [5].

[1] N. Nilius, T. M. Wallis and W. Ho, Science 297, 1853 (2002).

[2] A. Calzolari et al., Phys. Rev. Lett. 93, 096404 (2004).

[3] O. Bunk et al., Phys. Rev. B 59, 12228 (1999).

[4] J.-H. Cho et al., Phys. Rev. B 66, 075423 (2002).

[5] H. Morikawa et al., Phys. Rev. B 81, 075401(2010).