Electrochemical control of quantum interference in anthraquinone-based molecular switches.

@article{Markussen2010ElectrochemicalCO,
  title={Electrochemical control of quantum interference in anthraquinone-based molecular switches.},
  author={Troels Markussen and Jakob Schi{\"o}tz and Kristian Sommer Thygesen},
  journal={The Journal of chemical physics},
  year={2010},
  volume={132 22},
  pages={
          224104
        }
}
Using first-principles calculations we analyze the electronic transport properties of a recently proposed anthraquinone-based electrochemical switch. Robust conductance on/off ratios of several orders of magnitude are observed due to destructive quantum interference present in the anthraquinone but absent in the hydroquinone molecular bridge. A simple explanation of the interference effect is achieved by transforming the frontier molecular orbitals into localized molecular orbitals thereby… 
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References

SHOWING 1-10 OF 67 REFERENCES
Synthesis and properties of an anthraquinone-based redox switch for molecular electronics.
TLDR
A model anthraquinone system, substituted with tert-butylthio groups, can be reversibly switched electrochemically from cross conjugation to linear conjugated (high conductance "on") via two-electron reduction/oxidation reactions.
Quantum interference effects in electron transport through nitrobenzene with pyridil anchor groups
We present density-functional theory (DFT) based nonequilibrium Green's function calculations for the conductance through a nitrobenzene molecule, which is anchored by pyridil groups to Au
Quantum interference in acyclic systems: conductance of cross-conjugated molecules.
TLDR
These findings represent a new motif for electron transfer through molecules that exhibit both very high and very low tunneling conductance states accessible at low bias without nuclear motion, and allow a large dynamic range in conductance for single molecule electronic components.
Electrochemically controlled conductance switching in a single molecule: quinone-modified oligo(phenylene vinylene).
Reversible conductance switching in single quinone-oligo(phenylene vinylene) (Q-OPV) molecules was demonstrated using electrochemical STM. The switching was achieved by application of electrochemical
Quantum-interference-controlled molecular electronics.
TLDR
It is found that the quantum interference effect (QIE) is strongly dependent on the interaction between molecular pi-states and contact sigma-states, and is masked by sigma tunneling in small molecular rings with Au leads, due to strong pi-sigma hybridization.
Controlling quantum transport through a single molecule.
TLDR
A new device concept is proposed, the quantum interference effect transistor, that exploits perfect destructive interference stemming from molecular symmetry and controls current flow by introducing decoherence and/or elastic scattering that break the symmetry.
Interfering pathways in benzene: an analytical treatment.
The mechanism for off-resonant electron transport through small organic molecules in metallic junctions is predominantly coherent tunneling. Thus, new device functionalities based on quantum
Phase switching of a single isomeric molecule and associated characteristic rectification.
TLDR
The novel phase switching of a photoactive isomeric molecule, N-(2-mercaptoethyl)-4-phenylazobenzamide (Azo molecule) at a single-molecule level is observed, for the first time, which exhibits a distinctive change in the conductive characteristic under scanning tunneling microscope (STM) measurement.
Light-controlled conductance switching of ordered metal-molecule-metal devices.
TLDR
Reversible, light-controlled conductance switching of molecular devices based on photochromic diarylethene molecules, in which neighboring particles are bridged by switchable molecules, is demonstrated.
Molecular electronics with single molecules in solid-state devices.
TLDR
New insights are focused on how the electron transport properties of the molecule depend on the strength of the electronic coupling between it and the electrodes, and on how this coupling is weak, intermediate or strong.
...
1
2
3
4
5
...