Dresden 2009 – wissenschaftliches Programm
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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 42.102: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Structural Dependence of Optical Properties of Tellurium — •Stephan Blankenburg1,2, Wojciech Welnic1, and Lucia Reining1 — 1Laboratoire des Solides Irradiés, École Polytechnique, Paris, France — 2Theoretische Physik, Universität Paderborn,Paderborn, Germany
The further miniaturization of electronic and optoelectronic devices needs the understanding of fundamental material properties to open up new avenues for the nano-fabrication process. Essential steps for understanding the basic mechanisms are the experimental and theoretical study of well-defined model systems [1,2]. In this context, tellurium with its several chemical and physical properties is one of the elemental materials of interest. Due to the discrepancies between the theoretical and experimental determined optical parameters in the literature of Te [3,4], we used time-dependent density-functional theory to reveal the origin of this effect. The puzzling interplay between structural parameters and optical properties as well as the transition to one-dimensional Te nanowires are analyzed in detail.
[1] W. Welnic, et. al., Nature Materials 5, 56 (2006).
[2] W. Welnic, S. Botti, L. Reining, M. Wuttig, PRL 98, 236403 (2007).
[3] S. Tutuhashi, et. al., Phys. Rev. 3, 177 (1969).
[4] P. Ghosh, M. Upadhyay, U. V. Waghmare, PRB 75, 245437 (2007).