Franck-Condon Blockade and Giant Fano Factors in Transport through Single Molecules

Koch, Jens; Oppen, Felix von

doi:10.1103/physrevlett.94.206804

Cited by 518 publications

(847 citation statements)

References 23 publications

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“…The observed parallel lines in the SET region in Figure 2b are due to such transitions and therefore the energy spacing ∆E of the lines corresponds tohω 0 . The suppression of the conductance is predicted to be prominent for equilibrated vibrons with zero relaxation time 17 and for k B T ≪hω 0 , which meets our experimen- relative to the electrodes, although the frequency could be of the order of meV, as shown for the C 60 molecule. 5 The oscillations are coupled to the Fe 4 via displacement-dependent tunneling matrix elements.…”

supporting

confidence: 76%

“…A transition from the vibrational ground level n = 0 of the N state to the vibrational ground level of the N + 1 state is exponentially suppressed with λ . 17 The low-bias gap observed in Figure 2b is due to the suppression of this transition. However, the probability for transitions to occur from the n = 0 level of the N state to the n = 0 levels of the N + 1 state increases with a FC factor 24…”

mentioning

confidence: 88%

“…The zero-bias conductance suppression may originate from the FC blockade effect 17,24 which occurs when the dimensionless electron-vibron coupling λ is strong, i.e. λ ≫ 1.…”

mentioning

confidence: 99%

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Franck–Condon Blockade in a Single-Molecule Transistor

et al. 2014

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We investigate vibron-assisted electron transport in single-molecule transistors containing an individual Fe 4 Single-Molecule Magnet. We observe a strong suppression of the tunneling current at low bias in combination with vibron-assisted excitations. The observed features are explained by a strong electron-vibron coupling in the framework of the Franck-Condon model supported by density-functional theory.Vibrational modes (vibrons) play an essential role in the mechanics of a wide variety of nanostructures. In addition, they can couple to the electric charge, affecting the electrical transport

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confidence: 76%

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confidence: 88%

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Franck–Condon Blockade in a Single-Molecule Transistor

et al. 2014

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“…Inelastic effects in molecular junctions originate from coupling between electronic and nuclear degrees of freedom [57][58][59][60][61][62]. The nuclei are much heavier than the electrons.…”

Section: Vibrational Effectsmentioning

confidence: 99%

Single-molecule transport in three-terminal devices

Osorio

Bjørnholm

Lehn

et al. 2008

J. Phys.: Condens. Matter

103

114

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Transport through single molecules has been studied using different test beds. In this paper we focus on three-terminal devices in which a molecule bridges the gap between two gold electrodes and a third electrode-the gate-is able to modulate the conduction properties of the junction. Depending on the electronic coupling, , between the molecule and the gold electrodes, different transport regimes can be distinguished. We show measurements on junctions incorporating different single-molecule systems which demonstrate the distinction between these regimes, as well as the experimental limitations in controlling the exact value of .

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“…This is the essence of the Franck-Condon "blockade." [10][11][12][13][14] By chemically engineering molecules with strong electron-ion coupling and soft ͑low-frequency͒ vibrational modes one can achieve arbitrarily slow equilibrium switching rates.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent theory of molecular switching

2008

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We study the model of a molecular switch comprised of a molecule with a soft vibrational degree of freedom coupled to metallic leads. In the presence of strong electron-ion interaction, different charge states of the molecule correspond to substantially different ionic configurations, which can lead to very slow switching between energetically close configurations ͑Franck-Condon blockade͒. Application of transport voltage, however, can drive the molecule far out of thermal equilibrium and thus dramatically accelerate the switching. The tunneling electrons play the role of a heat bath with an effective temperature dependent on the applied transport voltage. Including the transport-induced "heating" self-consistently, we determine the stationary currentvoltage characteristics of the device and the switching dynamics for symmetric and asymmetric devices. We also study the effects of an extra dissipative environment and demonstrate that it can lead to enhanced nonlinearities in the transport properties of the device and dramatically suppress the switching dynamics.

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Franck-Condon Blockade and Giant Fano Factors in Transport through Single Molecules

Cited by 518 publications

References 23 publications

Franck–Condon Blockade in a Single-Molecule Transistor

Franck–Condon Blockade in a Single-Molecule Transistor

Single-molecule transport in three-terminal devices

Self-consistent theory of molecular switching

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