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Introducing molecular electronics by Gianaurelio Cuniberti, Giorgos Fagas, Klaus Richter

By Gianaurelio Cuniberti, Giorgos Fagas, Klaus Richter

This quantity provides a precis of our present knowing of molecular electronics mixed with chosen cutting-edge effects at a degree obtainable to the complicated undergraduate or amateur postgraduate. This unmarried ebook includes the elemental wisdom of either conception and scan underpinning this quickly transforming into box. strategies and strategies equivalent to density useful concept and cost delivery, holiday junctions and scanning probe microscopy are brought step by step and are hence utilized in particular examples. The textual content addresses quite a lot of platforms together with molecular junctions made from single-molecules, self-assembled monolayers, carbon nanotubes and DNA.

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Angenbachen, P. M¨ uller, M. Richter, A. Ogrodnik, H. E. Michel-Beyerle, Biophys. J. 71, A8 (1997); see also M. Bixon and J. Jortner, [11]). The activationless behavior (upper curve) corresponds to the wild-type reaction center while crossing from super-exchenge at low temperature to activated behavior at higher T is exhibited in a chemically engineered reaction center in which the bacteriochlorophyl is replaced by vinyl bacteriochlorophyl Fig. 6. Temperature dependence of the current through 1-nitro-2,5-di (phenylethynyl- 4’ -mercapto) benzene molecules between gold electrodes, showing transition from non-activated to activated behavior with a bias-dependent activation energy (After [70]) Foundations of Molecular Electronics – Charge Transport 29 Fig.

The two electrodes are assumed made of the same material, which is taken to be simple metal with a Fermi level denoted Ef . The discrete levels shown for the molecule represent (just as the continuum levels in the metal do) one-electron energies. In particular, the highest-occupied and lowest empty molecular orbitals (HOMO and LUMO respectively) define a gap, and Ef must lie within this gap. Under conditions where these metals are thermally equilibrated, the Landauer formula for the coherent conductance of the junction is given by (1) ∞ e ∂ dET (E) (f (E) − f (E + e Φ)) (3) g(Φ) = π ∂Φ 0 (here g, Φ, T, f, E, are respectively the conductance, the voltage, the transmission through the molecular junction, the Fermi functions describing the populations on the two metal leads and the energy variable).

Finally, the vision to adjust and to monitor the operation of these devices brings out the need to understand different control modes, ranging from structural design to interaction with external forces such as a radiation field or other molecular entities. During the past half century remarkable progress was made in establishing the conceptual framework for electron transfer (ET) processes [11] in molecular, supermolecular, and biophysical systems. ET provides a central conceptual and technical basis for molecular electronics, pertaining both to molecular devices and to molecular materials.

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