Electromechanics of charge shuttling in dissipative nanostructures

Nord, T.; Gorelik, Leonid Y.; Shekhter, R. I.; Jonson, M.

doi:10.1103/physrevb.65.165312

Cited by 45 publications

(43 citation statements)

References 16 publications

(30 reference statements)

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“…Electron tunneling is determined by the probabilities P The number of electrons transferred in one cycle will depend on the capacitance, C, of the shuttle, its vibration frequency, and applied voltage, V. Transition to the shuttling regime manifests itself as a sudden increase in the transmitted current. So large change in the current through a shuttle-junction can be associated with the so-called hard excitation of oscillations, 16 which is typical for system with large dissipation.…”

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Nanomechanical electron shuttle consisting of a gold nanoparticle embedded within the gap between two gold electrodes

et al. 2009

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Nanomechanical shuttles transferring small groups of electrons or even individual electrons from one electrode to another offer a novel approach to the problem of controlled charge transport. Here, we report the fabrication of shuttle-junctions consisting of a 20 nm diameter gold nanoparticle embedded within the gap between two gold electrodes. The nanoparticle is attached to the electrodes through a monolayer of "flexible" organic molecules which play the role of "springs" so that when a sufficient voltage bias is applied, the nanoparticle starts to oscillate transferring electrons from one electrode to the other. Currentvoltage characteristics for the fabricated devices have been measured and compared with the results of our computer simulations.In 1998, a group of theoreticians 1 proposed a novel mechanism of charge transport in nanostructures based on mechanical shuttling of electrons. The basic element (see Fig. 1), which is called a shuttle-junction, consists of a metallic nanoparticle connected by flexible, "elastic" molecules to two nanoelectrodes. For low applied voltages where the nanoparticle is stationary the device is similar to a single-electron transistor (SET). 2 The vibrational process

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Nanomechanical electron shuttle consisting of a gold nanoparticle embedded within the gap between two gold electrodes

et al. 2009

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“…Since current through the system is accompanied by charging of the grain, interplay between the Coulomb forces and the mechanical degrees of freedom can lead to self-oscillations of the grain, which in turn, supports charge transport through shuttling of electrons between the leads. Much work, both experimental [5,6,7,8,9] as well as theoretical [4,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24] has been reported in this field.…”

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Low-frequency current noise of the single-electron shuttle

Isacsson

Nord

2004

Europhys. Lett.

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Coupling between electronic and mechanical degrees of freedom in a single electron shuttle system can cause a mechanical instability leading to shuttle transport of electrons between external leads. We predict that the resulting low frequency current noise can be enhanced due to amplitude fluctuations of the shuttle oscillations. Moreover, at the onset of mechanical instability a pronounced peak in the low frequency noise is expected. *

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“…The mesoscopic force oscillations in nanowires [3][4][5] observed a few years ago is an example of such a phenomenon. Investigations of artificially-made nanomechanical devices, where the interplay between single-electron tunneling and a local mechanical degree of freedom significantly controls the electronic transport, is another line of nanoelectromechanics [6][7][8][9][10][11][12][13][14][15]. For one of the nanomechanical systems of this kind, the self-assembled single-electron transistor, a new electromechanical phenomena -the shuttle instability and a new so-called shuttle mechanism of the charge transport were recently predicted in [12].…”

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Vibrational instability due to coherent tunneling of electrons

et al. 2002

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Abstract. -Effects of a coupling between the mechanical vibrations of a quantum dot placed between the two leads of a single electron transistor and coherent tunneling of electrons through a single level in the dot has been studied. We have found that for bias voltages exceeding a certain critical value a dynamical instability occurs and mechanical vibrations of the dot develop into a stable limit cycle. Introduction. -Nanoelectromechanics [1, 2] is a new, quickly developing field in condensed matter physics. A coupling between strongly pronounced mesoscopic features of the electronic degrees of freedom (such as quantum coherence and quantum correlations) and degrees of freedom connected to deformations of the material produces strong electromechanical effects on the nanometer scale. The mesoscopic force oscillations in nanowires [3-5] observed a few years ago is an example of such a phenomenon. Investigations of artificially-made nanomechanical devices, where the interplay between single-electron tunneling and a local mechanical degree of freedom significantly controls the electronic transport, is another line of nanoelectromechanics [6][7][8][9][10][11][12][13][14][15]. For one of the nanomechanical systems of this kind, the self-assembled single-electron transistor, a new electromechanical phenomena -the shuttle instability and a new so-called shuttle mechanism of the charge transport were recently predicted in [12]. It was shown that a small metallic grain attached to two metallic electrodes by elastically deformable links breaks into oscillations if a large enough bias voltage is applied between the leads. For the model system studied in [12], it was also shown that a finite friction is required for the oscillation amplitude to saturate and for a stable regime of oscillations to develop.An essential assumption made in [12] is that the relaxation mechanisms present are strong enough to keep the electron systems in each of the conducting parts of the transistor in local equilibrium (as assumed in the standard theory of Coulomb blockade [16,17]). Such relaxation, which destroys any phase coherence between electron tunneling events, allows a description of

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Electromechanics of charge shuttling in dissipative nanostructures

Cited by 45 publications

References 16 publications

Nanomechanical electron shuttle consisting of a gold nanoparticle embedded within the gap between two gold electrodes

Nanomechanical electron shuttle consisting of a gold nanoparticle embedded within the gap between two gold electrodes

Low-frequency current noise of the single-electron shuttle

Vibrational instability due to coherent tunneling of electrons

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