An electrostatic gate for mechanically controlled single-molecule junctions

Ballmann, Stefan; Weber, Heiko B.

doi:10.1088/1367-2630/14/12/123028

Cited by 24 publications

(18 citation statements)

References 20 publications

(29 reference statements)

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“…17,154,155 Such an electrode is capacitively coupled to the junction and acts to shift the level positions m with respect to the Fermi levels of the leads. Dependence on gate voltage can help to reveal the nature of conduction processes.…”

Section: Gate-voltage Dependencementioning

confidence: 99%

Decoherence and lead-induced interdot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach

et al. 2013

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The interplay between interference effects and electron-electron interactions in electron transport through an interacting double quantum dot system is investigated using a hierarchical quantum master equation approach which becomes exact if carried to infinite order and converges well if the temperature is not too low. Decoherence due to electron-electron interactions is found to give rise to pronounced negative differential resistance, enhanced broadening of structures in current-voltage characteristics, and an inversion of the electronic population. Dependence on gate voltage is shown to be a useful method of distinguishing decoherence-induced phenomena from effects induced by other mechanisms such as the presence of a blocking state. Comparison of results obtained by the hierarchical quantum master equation approach to those obtained from the Born-Markov approximation to the Nakajima-Zwanzig equation and from the noncrossing approximation to the nonequilibrium Green's function reveals the importance of an interdot coupling that originates from the energy dependence of the conduction bands in the leads and the need for a systematic perturbative expansion.

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Section: Gate-voltage Dependencementioning

confidence: 99%

Decoherence and lead-induced interdot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach

et al. 2013

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“…[1][2][3][4][5][6][7][8][9][10] Single molecule junctions, consisting of single molecules that are chemically bound to metal electrodes, are well-suited systems to study nonequilibrium transport phenomena at the nanoscale and are also of interest for potential applications in the field of molecular electronics. Recent developments in experimental techniques, such as electromigration, mechanically controllable break junctions, or scanning tunneling microscopy, 1, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] have made it possible to study transport properties of molecular junctions. The rich experimental observations, e.g., Coulomb blockade, 13 Kondo effect, 29 negative differential resistance, 26,30,31 switching and hysteresis, [32][33][34] have stimulated many theoretical developments for understanding quantum transport at the molecular scale.…”

Section: Introductionmentioning

confidence: 99%

Numerically exact, time-dependent study of correlated electron transport in model molecular junctions

Wang

Thoss

2013

The Journal of Chemical Physics

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The multilayer multiconfiguration time-dependent Hartree theory within second quantization representation of the Fock space is applied to study correlated electron transport in models of singlemolecule junctions. Extending previous work, we consider models which include both electronelectron and electronic-vibrational interaction. The results show the influence of the interactions on the transient and the stationary electrical current. The underlying physical mechanisms are analyzed in conjunction with the nonequilibrium electronic population of the molecular bridge.

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“…pulling the junction plays the role of gating. Since gating a molecular junction is a challenging task [24,[34][35][36], this result puts an additional advantage on hybrid junctions.…”

Section: Resultsmentioning

confidence: 99%

“…Second, many calculations show enhanced thermoelectric performance based on tuning of the molecular orbitals or, equivalently, the Fermi level of the electrodes. However, in reality this tuning is very difficult to achieve [24,[34][35][36], and the only "tuning parameter" available for molecular junctions is the choice of the molecular moiety. It is thus a central challenge to design molecular junctions that are both tunable in some way and show favorable thermoelectric performance with realistic parameters.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Performance of Hybrid Nanoparticle–Single-Molecule Junctions

Zerah-Harush

2015

Phys. Rev. Applied

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It was recently suggested that molecular junctions would be excellent elements for efficient and high-power thermoelectric energy conversion devices. However, experimental measurements of thermoelectric conversion in molecular junctions have indicated rather poor efficiency, raising the question of whether it is indeed possible to design a setup for molecular junctions that will exhibit enhanced thermoelectric performance. Here we suggest that hybrid single-molecule nanoparticle junctions can serve as efficient thermoelectric converters. The introduction of a semiconducting nanoparticle introduces new tuning capabilities, which are absent in conventional metal-moleculemetal junctions. Using a generic model for the molecule and nanoparticle with realistic parameters, we demonstrate that the thermopower can be of the order of hundreds of microvolts per degree Kelvin, and that the thermoelectric figure of merit can reach values close to one, an improvement of four orders of magnitude improvement over existing measurements. This favorable performance persists over a wide range of experimentally relevant parameters, and is robust against disorder (in the form of surface-attached molecules) and against electron decoherence at the nanoparticle molecule interface. arXiv:1506.02164v1 [cond-mat.mes-hall]

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An electrostatic gate for mechanically controlled single-molecule junctions

Cited by 24 publications

References 20 publications

Decoherence and lead-induced interdot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach

Decoherence and lead-induced interdot coupling in nonequilibrium electron transport through interacting quantum dots: A hierarchical quantum master equation approach

Numerically exact, time-dependent study of correlated electron transport in model molecular junctions

Enhanced Thermoelectric Performance of Hybrid Nanoparticle–Single-Molecule Junctions

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