Investigation of potential inversion in the reduction of 9,10-dinitroanthracene and 3,6-dinitrodurene

Kraiya, Charoenkwan; Evans, Dennis H.

doi:10.1016/j.jelechem.2003.09.024

Cited by 32 publications

(33 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other cases, significant structural changes accompany the reductions and potential inversion can occur. That is, introduction of the second electron occurs more easily than introduction of the first, E°1 À E°2 being negative [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Studies of the electrochemical reduction of some dinitroaromatics

Macı́as-Ruvalcaba

Telo²,

Evans

2007

Journal of Electroanalytical Chemistry

Self Cite

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Studies of the electrochemical reduction of some dinitroaromatics

Macı́as-Ruvalcaba

Telo²,

Evans

2007

Journal of Electroanalytical Chemistry

Self Cite

View full text Add to dashboard Cite

“…In physics, the concept of negative-U centers was first pointed out more than three decades ago [10], and is realized in many amorphous semiconductors. In chemistry, the scenario of negative U is known as "potential inversion" [11]. An important ingredient in realizing this scenario in molecular junctions may be a reduction of the true molecular charging energy by screening due to metallic electrodes [12] or an electrolytic environment [13].…”

mentioning

confidence: 99%

Pair Tunneling through Single Molecules

2006

View full text Add to dashboard Cite

By a polaronic energy shift, the effective charging energy of molecules can become negative, favoring ground states with even numbers of electrons. Here we show that charge transport through such molecules near ground-state degeneracies is dominated by tunneling of electron pairs which coexists with (featureless) single-electron cotunneling. Because of the restricted phase space for pair tunneling, the current-voltage characteristics exhibit striking differences from the conventional Coulomb blockade. In asymmetric junctions, pair tunneling can be used for gate-controlled current rectification and switching.

show abstract

“…an effectively attractive electron-electron interaction. In electrochemistry, examples for this scenario are in fact known [41]. Negative U causes the system to favor even occupation numbers, and by tuning the gate voltage the charge states n = 0 and n = 2 can become degenerate.…”

Section: Negative-u Moleculesmentioning

confidence: 99%

Novel Quantum Transport Effects in Single-Molecule Transistors

Oppen

Koch

2008

Advances in Solid State Physics

View full text Add to dashboard Cite

Transport through single molecules differs from transport through more conventional nanostructures such as quantum dots by the coupling to few welldefined vibrational modes. A well-known consequence of this coupling is the appearance of vibrational side bands in the current-voltage characteristics. We have recently shown that the coupling to vibrational modes can lead to new quantum transport effects for two reasons. (i) When vibrational equilibration rates are sufficiently slow, the transport current can drive the molecular vibrations far out of thermal equilibrium. In this regime, we predict for strong electron-phonon coupling that electrons pass the molecule in avalanches of large numbers of electrons. These avalanches consist themselves of smaller avalanches, interupted by long waiting times, and so on. This self-similar avalanche transport is reflected in exceptionally large current (shot) noise, as measured by the Fano factor, as well as a power-law frequency spectrum of the noise. (ii) Due to polaronic energy shifts, the effective charging energy of molecules may be strongly reduced compared to the pure Coulomb charging energy. In fact, for certain molecules the effective charging energy U can become negative, a phenomenon known in chemistry as potential inversion. We predict that transport through such negative-U molecules near charge-degeneracy points, where the Coulomb blockade is lifted, is dominated by tunneling of electron pairs. We show that the dependence of the corresponding Coulomb-blockade peaks on temperature and bias voltage is characteristic of the reduced phase space for pair tunneling.

show abstract

Investigation of potential inversion in the reduction of 9,10-dinitroanthracene and 3,6-dinitrodurene

Cited by 32 publications

References 21 publications

Studies of the electrochemical reduction of some dinitroaromatics

Studies of the electrochemical reduction of some dinitroaromatics

Pair Tunneling through Single Molecules

Novel Quantum Transport Effects in Single-Molecule Transistors

Contact Info

Product

Resources

About