Switchable nanometer contacts: Ultrathin Ag nanostructures on Si(100)

Gardinowski, G.; Schmeidel, Jȩdrzej; Pfnür, H.; Block, T.; Tegenkamp, Christoph

doi:10.1063/1.2336650

Cited by 22 publications

(21 citation statements)

References 15 publications

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“…This is close to the calculated conductance value for a single FDT molecule in between perfect Ag(111) contacts. However, the contacts used are far from an ideal single crystal 34 , and adsorption is expected to first happen on the energetically most favorable sites, which are the defect sites according to our calculations.…”

Section: Electronic Transportmentioning

confidence: 99%

Ferrocene-1,1′-dithiol as molecular wire between Ag electrodes: The role of surface defects

Bredow

Tegenkamp

Pfnür

et al. 2008

The Journal of Chemical Physics

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The interaction of ferrocene-1,1 ′ -dithiol (FDT) with two parallel Ag(111) surfaces has been theoretically studied at density-functional level. The effect of surface defects on the energetic and electronic structure was investigated. The electronic transport properties are studied with the non-equilibrium Green's function approach. The adsorption geometry has a strong effect on the electronic levels and conductivity. The presence of point defects strongly enhances the molecule-surface interaction but has a surprisingly small effect on the density of states near the Fermi energy. The FDT-surface bond is particularly strong near terraces or steps and leads to significant shifts of the molecular orbitals relative to the gas phase. For all considered defect types except the single adatom the electronic conductivity through the FDT molecule is decreased compared to adsorption on perfect surfaces.PACS 71.15.Mb, 73.63.Kv 2

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Section: Electronic Transportmentioning

confidence: 99%

Ferrocene-1,1′-dithiol as molecular wire between Ag electrodes: The role of surface defects

Bredow

Tegenkamp

Pfnür

et al. 2008

The Journal of Chemical Physics

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“…A molecular wire, containing ferrocene as the central functional molecular unit, has been reported to exhibit remarkably high conductance in comparison to an organic wire of similar length without ferrocene unit . Most recent research with ferrocene as functional unit has been done with thiols as end groups and noble metals as electrode materials, such as Ag or Au . The Au‐thiol bond is known to be strong and very robust, and several experiments have been carried out with this combination .…”

Section: Introductionmentioning

confidence: 99%

Charge Transport through Ferrocene 1,1′‐Diamine Single‐Molecule Junctions

Kanthasamy

Ring

Nettelroth

et al. 2016

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The charge transport through ferrocene 1,1′‐diamine (FDA) molecules between gold electrodes is investigated using the mechanically controllable break junction technique combined with a theoretical framework of density functional theory simulations to understand the physics of these molecular junctions. The characteristic conductances of the molecule are measured at low bias as well as current–voltage (IV) characteristics. By fitting the IV characteristics to the single‐level model, the values for the position of the molecular level, mainly responsible for the transport, and its coupling to the leads, are obtained. The influence of the binding sites, molecular conformation, and electrode distance are systematically studied from a theoretical perspective. While a strong dependence of conductance on the adsorption geometry is found, the decrease of conductance as a function of electrode distance arises mainly from a decrease of coupling strength of the molecular electronic orbitals through a reduced overlap and, to a lesser extent, from a shift of their alignment with respect to the Fermi energy.

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“…This holds true even more strictly for the local contacts on the atomic scale. While the existence of such contacts, e.g., in break junctions [7], is well established, the control on the atomic scale is still at its beginning [8]. This sequence of necessary control steps seems to be quite demanding, but, as discussed in the following paragraph, it is also fascinating from a physical perspective.…”

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confidence: 97%

Correlation of geometrical and electronic properties in metallic nanowires

Pfnür

Tegenkamp

Czubanowski

et al. 2010

Physica Status Solidi (b)

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The structure on the atomic scale was found to be directly correlated with the electronic and transport properties of ultrathin metallic wires. We present examples of both self-organized and artificially structured nanowires in the system Pb/Si(557). We demonstrate that artificial structuring on the nanoscale allows identification and determination of the electrical transport properties of atomic size defects, using Si(557) as a quasiinsulating substrate and a Si double step in a monolayer high Pb nanowire as an example. One-dimensional (1D) properties with strong electron correlation and various instabilities in metallic chains or ribbons generated by metal adsorption of submonolayers on insulating substrates like Si(111) or Si(557) turn out to always be modified by the unavoidable coupling to 2D and 3D. The wealth of new and partly unexpected phenomena is exemplified here again in monolayers of Pb on Si(557), which forms wire-like arrays. We identify structural self-stabilization as the origin of 1D electronic transport and show that a new 1D state is generated by step decoration. Magnetoconductance measurements yield even deeper insight into mechanisms of electronic transport, as also exemplified in this specific system.

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Switchable nanometer contacts: Ultrathin Ag nanostructures on Si(100)

Cited by 22 publications

References 15 publications

Ferrocene-1,1′-dithiol as molecular wire between Ag electrodes: The role of surface defects

Ferrocene-1,1′-dithiol as molecular wire between Ag electrodes: The role of surface defects

Charge Transport through Ferrocene 1,1′‐Diamine Single‐Molecule Junctions

Correlation of geometrical and electronic properties in metallic nanowires

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