Browsing by Author "Fehske, Holger"

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Citation Count: Quandt, A...et al. (2008). Boron doped graphene nanostructures. Physica Status Solidi B Basic Solid State Physics, 245(10), 2077-2081. http://dx.doi.org/10.1002/pssb.200879559
Boron doped graphene nanostructures
(Wiley-Blackwell, 2008) Quandt, Alexander; Özdoğan, Cem; Kuntsmann, Jens; Fehske, Holger
We present results from an ab initio study of metallized semiconducting graphene nanostructures. Our model system consists of an alternating chain of quasi-planar B(7) clusters embedded into a semiconducting arm-chair nanoribbon. We observe the appearance of overlapping bands around the Fermi-level, with crystal momenta pointing into the direction of these boron chains. This observation could be a vantage point for the development of graphene nanodevices and integrated nanocircuits, based on existing technologies
Citation Count: Quandt, Alexander; Ozdogan, Cem; Kunstmann, Jens, "Functionalizing graphene by embedded boron clusters", Nanotechnology, Vol.19, No.33, (2008).
Functionalizing graphene by embedded boron clusters
(IOP Publishing LTD, 2008) Quandt, Alexander; Özdoğan, Cem; Kunstmann, Jens; Fehske, Holger; 40569
We present a model system that might serve as a blueprint for the controlled layout of graphene based nanodevices. The systems consists of chains of B-7 clusters implanted in a graphene matrix, where the boron clusters are not directly connected. We show that the graphene matrix easily accepts these alternating B-7-C-6 chains and that the implanted boron components may dramatically modify the electronic properties of graphene based nanomaterials. This suggests a functionalization of graphene nanomaterials, where the semiconducting properties might be supplemented by parts of the graphene matrix itself, but the basic wiring will be provided by alternating chains of implanted boron clusters that connect these areas.
Citation Count: Kuntsmann, J...et al. (2011). Stability of edge states and edge magnetism in graphene nanoribbons. Physical Review B, 83(4). http://dx.doi.org/10.1103/PhysRevB.83.045414
Stability of edge states and edge magnetism in graphene nanoribbons
(Amer Physical Soc, 2011) Kuntsmann, Jens; Özdoğan, Cem; Quandt, Alexander; Fehske, Holger
We critically discuss the stability of edge states and edge magnetism in zigzag edge graphene nanoribbons (ZGNRs). We point out that magnetic edge states might not exist in real systems and show that there are at least three very natural mechanisms-edge reconstruction, edge passivation, and edge closure-which dramatically reduce the effect of edge states in ZGNRs or even totally eliminate them. Even if systems with magnetic edge states could be made, the intrinsic magnetism would not be stable at room temperature. Charge doping and the presence of edge defects further destabilize the intrinsic magnetism of such systems