Spin-current rectification in molecular wires

Dalgleish, Hugh; Kirczenow, George

doi:10.1103/physrevb.73.235436

Cited by 78 publications

(79 citation statements)

References 42 publications

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“…3,22,23,24,25,26,27,28,29,30,31,32 In a step towards a more realistic description of the geometry, symmetries, and the electronic structure of particular molecules, empirical TB approaches such as the (extended) Hückel method have proved useful. 4,8,33,34,35 Based on a combination of density-functional calculations and simple phenomenological considerations, we have recently described the photoconductance of metaloligophenylene-metal junctions. 5 It was discussed how the linear-response conductance may increase by orders of magnitude in the presence of light.…”

Section: Introductionmentioning

confidence: 99%

Modeling elastic and photoassisted transport in organic molecular wires: Length dependence and current-voltage characteristics

2008

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Using a π-orbital tight-binding model, we study the elastic and photoassisted transport properties of metal-molecule-metal junctions based on oligophenylenes of varying lengths. The effect of monochromatic light is modeled with an ac voltage over the contact. We first show how the low-bias transmission function can be obtained analytically, using methods previously employed for simpler chain models. In particular, the decay coefficient of the off-resonant transmission is extracted by considering both a finite-length chain and infinitely extended polyphenylene. Based on these analytical results, we discuss the length dependence of the linear-response conductance, the thermopower, and the light-induced enhancement of the conductance in the limit of weak intensity and low frequency. In general the conductance-enhancement is calculated numerically as a function of the light frequency. Finally, we compute the current-voltage characteristics at finite dc voltages, and show that in the low-voltage regime, the effect of low-frequency light is to induce current steps with a voltage separation determined by twice the frequency. These effects are more pronounced for longer molecules. We study two different profiles for the dc and ac voltages, and it is found that the results are robust with respect to such variations. Although we concentrate here on the specific model of oligophenylenes, the results should be qualitatively similar for many other organic molecules with a large enough electronic gap.

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Section: Introductionmentioning

confidence: 99%

Modeling elastic and photoassisted transport in organic molecular wires: Length dependence and current-voltage characteristics

2008

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“…15 It is reported that the interface states between the conduction and the electrodes dominate the transmission through the junction at moderate bias. 16 The tunneling current depends on the transition between the density of state of the metal electrode and the one side of the sample. 17,18 Under bias the energies of these interface states lock to the shifting electrochemical potentials of the contacts.…”

Section: Resultsmentioning

confidence: 99%

Room Temperature Negative Differential Resistance in Au/Single ZnO Wire/Au Junction Structure

Yang

Chen

Lee³

2007

ECS Trans.

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We have fabricated a novel device composed of a single ZnO wire bridged on a pair of Au electrodes. The charge transport in Au/single ZnO wire/Au is investigated by the current-voltage measurement. A negative differential resistance behavior (NDR) in current-voltage curve of single compound semiconductor wire is first observed at room temperature. A peak-to-valley current ratio is greater than 3:1. The NDR may be due to a specific metal-wire surface contact nanoscale contacts and electronic coupling between a single ZnO wire and Au electrodes. It is expected that ZnO wire can be applied to the nanoelectronic devices.

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“…Therefore, in single gold atom junctions, T is one. When transition metals are used as electrodes, not only are they easily oxidized, but their d orbitals are used for the single atom junctions and SMJ orbitals; this means that several electron paths are used, which complicates the conductance behavior in the junction; 53,66,67 as such, gold electrodes are preferred.…”

Section: Single-molecule Analysis Methodsmentioning

confidence: 99%

Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

Taniguchi

2017

Bulletin of the Chemical Society of Japan

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Single-molecule analysis methods facilitate the investigation of the properties of single-molecule junctions (SMJs), in which single molecules are connected between a pair of nanoelectrodes that use nanogap electrodes having a spacing of less than several nanometers. Various methods have been developed to investigate numerous useful parameters for SMJs; for example, the number of molecules connected between a pair of nanoelectrodes can be determined, the types and structures of single molecules can be revealed, localized temperatures within SMJs can be evaluated, and the Seebeck coefficient and the bond strength between single molecules and electrodes can be ascertained. Single-molecule analysis methods have also been used to analyze biopolymers in solutions, and this has resulted in single-molecule sequencing technologies being developed that can determine sequences of base molecules in DNA and RNA along with sequences of amino acids in peptides. Singlemolecule analysis methods are expected to develop into digital analysis techniques that can be used to investigate the physical and chemical properties of molecules at single-molecule resolutions.

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Spin-current rectification in molecular wires

Cited by 78 publications

References 42 publications

Modeling elastic and photoassisted transport in organic molecular wires: Length dependence and current-voltage characteristics

Modeling elastic and photoassisted transport in organic molecular wires: Length dependence and current-voltage characteristics

Room Temperature Negative Differential Resistance in Au/Single ZnO Wire/Au Junction Structure

Single-Molecule Analysis Methods Using Nanogap Electrodes and Their Application to DNA Sequencing Technologies

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