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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.26: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Temperature- and adatom-induced conductance modification of In/Si(111)-(4x1) nanowires — •Nadja Koch, Simone Sanna, Stefan Wippermann, and Wolf Gero Schmidt — Lehrstuhl für theoretische Physik, Universität Paderborn, Warburger Str. 100, 33098 Paderborn

Quasi one-dimensional structures, such as artificial atomic-scale wires, attract considerable attention due to their fascinating physical properties and large technological potential [1]. Highly anisotropic surface superstructures such as the In/Si(111)-(4x1) nanowire array are suitable model systems to explore atomic-scale wires both experimentally and computationally [2,3]. As a contribution to the understanding of the controversially discussed low-temperature phase transition of the In nanowires, we present ab-initio calculations of their temperature-dependent Landauer conductance. Additionally, we calculate the influence of adatoms (In, Pb, H, O) on the nanowire cond. [4]. Our results for In deposition, where exp. data are available, agree very well with the measurements [5]. The cond. drop due to adatoms is explained in terms of potential-well scatt. and/or structural deform. of the nanowires.

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

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

[3] A A Stekolnikov, K Seino, F Bechstedt, S Wippermann, W G Schmidt, A Calzolari, M B Nardelli, Phys Rev Lett 98, 026105 (2007)

[4] S Wippermann, N Koch and W G Schmidt, Phys Rev Lett 100, 106802 (2008).

[5] T Tanikawa et al., Phys Rev Lett 93, 016801 (2004).