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Browsing by Author "Oezdogan, Cem"

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    About Nanometer Sized Analogues of Basic Electronic and Optical Components
    (Ieee, 2008) Quandt, A.; Özdoǧan, C.; Ferrari, M.; Speranza, G.; Oezdogan, Cem
    We discuss a downsizing of optical components into the nanometer range. It presupposes the substitution of photons by ballistic electrons, but it also requires a simple and robust concept to assemble the analogues of basic electronic and optical components on such a tiny length scale. Here, one of the most promising candidate schemes employs graphene as a basic nanosubstrate. We elucidate the suggested behaviour of graphene as an electronic metamaterial [1], and show that other desired electronic or optical functionalities may be obtained through a patterning with sub-nanometer sized boron clusters [2]. © 2008 IEEE.
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    Article
    Citation - WoS: 53
    Citation - Scopus: 61
    Structure and Energetic of Bn (n=2-12) Clusters: Electronic Structure Calculations
    (Wiley, 2007) Oezdogan, Cem; Guevenc, Ziya B.; Atis, Murat; Özdoǧan, Cen; Güvenç, Ziya B.
    The electronic and geometric structures, total and binding energies, first and second energy differences, harmonic frequencies, point symmetries, and highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gaps of small and neutral B-n (n = 2-12) clusters have been investigated using density functional theory (DFT), B3LYP with 6-311 + + G(d,p) basis set. Linear, planar, convex, quasi-planar, three-dimensional (3D) cage, and open-cage structures have been found. None of the lowest energy structures and their isomers has an inner atom; i.e., all the atoms are positioned at the surface. Within this size range, the planar and quasi-planar (convex) structures have the lowest energies. The first and the second energy differences are used to obtain the most stable sizes. A simple growth path is also discussed with the studied sizes and isomers. The results have been compared with previously available theoretical and experimental works. (C) 2006 Wiley Periodicals, Inc.