The Characterization of Electronic Noise in the Charge Transport through Single‐Molecule Junctions

Yuán, Sàisài; Gao, Tengyang; Cao, Wen‐Qiang; Pan, Zhichao; Liu, Junyang; Shi, Jia; Hong, Wenjing

doi:10.1002/smtd.202001064

Cited by 13 publications

(13 citation statements)

References 117 publications

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“…Unlike equilibrium conditions, fluctuations in nonequilibrium systems are more difficult to quantify due to the failure of the fluctuation-dissipation relation [10][11][12]. The rapidly-growing fields of stochastic and quantum thermodynamics [13][14][15][16][17][18] have significantly enhanced our fundamental understanding of nonequilibrium fluctuations [19,20] with practical ramifications such as in the application of electronic noise to measure molecular properties [21,22]. The discovery of fluctuation relations [14,15,17,[23][24][25] provided the underlying connection between macroscopic thermodynamics and the thermodynamics of small systems.…”

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confidence: 99%

Universal Bounds on Fluctuations in Continuous Thermal Machines

et al. 2021

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We study bounds on ratios of fluctuations in steady-state time-reversal heat engines controlled by multi affinities. In the linear response regime, we prove that the relative fluctuations (precision) of the output current (power) is always lower-bounded by the relative fluctuations of the input current (heat current absorbed from the hot bath). As a consequence, the ratio between the fluctuations of the output and input currents are bounded both from above and below, where the lower (upper) bound is determined by the square of the averaged efficiency (square of the Carnot efficiency) of the engine. The saturation of the lower bound is achieved in the tight-coupling limit when the determinant of the Onsager response matrix vanishes. Our analysis can be applied to different operational regimes, including engines, refrigerators, and heat pumps. We illustrate our findings in two types of continuous engines: two-terminal coherent thermoelectric junctions and three-terminal quantum absorption refrigerators. Numerical simulations in the far-from-equilibrium regime suggest that these bounds apply more broadly, beyond linear response.

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confidence: 99%

Universal Bounds on Fluctuations in Continuous Thermal Machines

et al. 2021

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“…[11] In the present work, we demonstrate that some of these ambiguities can originate from the sensitivity of QI in azulene to the environmental effect. [17,18] In this work, we investigate the electronic structure of azulene and its alternant hydrocarbon, naphthalene, and their transport properties between gold electrodes using first-principle calculations. We study changes in QI through these molecules and demonstrate that the orbital rules that are widely used to predict QI break down in both molecules.…”

Section: Introductionmentioning

confidence: 99%

Influence of Environmental Fluctuations on Quantum Interference in Naphthalene and Azulene

Alqahtani,

Sangtarash,

Sadeghi

2023

Small Science

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Both naphthalene and azulene have the same number of carbon and hydrogen atoms, but the former is an alternant hydrocarbon and the latter is a nonalternant hydrocarbon. This leads to a large difference in their electronic and transport properties. Herein, quantum transport is investigated through these two molecules and it is shown how quantum interference (QI) affects their electrical conductance. It is demonstrated that the orbital rule to predict QI breaks down in both naphthalene and azulene. The influence of environmental fluctuations on their QI and electrical conductance is also investigated. The results show that QI in azulene is more sensitive to environmental fluctuations than in naphthalene. In particular, destructive QI can be changed to constructive QI in azulene by small environmental fluctuations.

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“…1,2,4,6,7 The basic output of the break junction measurements is a statistical ensemble of conductance vs. electrode separation traces, from which the fingerprints of the single-molecule configurations can be visualized on conductance histograms. This analysis is frequently extended by more delicate experimental methods, like force, 2,[8][9][10][11] noise, [11][12][13][14][15][16][17][18][19][20][21][22] thermoelectric power, 2,23,24 thermal conductance, [25][26][27] quantum conductance fluctuation 28,29 or superconducting subgap spectroscopy measurements. 30,31 The combination of such methods was found to be extremely efficient in resolving the fine details of the structural and electronic properties of single-molecule nanowires.…”

Section: Introductionmentioning

confidence: 99%

Configuration-specific insight to single-molecule conductance and noise data revealed by principal component projection method

Balogh¹,

Mezei²,

Nóra³

et al. 2023

Preprint

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We explore the merits of neural network boosted, principal-component-projection-based, unsupervised data classification in singlemolecule break junction measurements, demonstrating that this method identifies highly relevant trace classes according to the welldefined and well-visualized internal correlations of the dataset. To this end, we investigate single-molecule structures exhibiting double molecular configurations, exploring the role of the leading principal components in the identification of alternative junction evolution trajectories. We show how the proper principal component projections can be applied to separately analyze the high or low-conductance molecular configurations, which we exploit in 1/ f -type noise measurements on bipyridine molecules. This approach untangles the unclear noise evolution of the entire dataset, identifying the coupling of the aromatic ring to the electrodes through the π orbitals in two distinct conductance regions, and its subsequent uncoupling as these configurations are stretched.

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The Characterization of Electronic Noise in the Charge Transport through Single‐Molecule Junctions

Cited by 13 publications

References 117 publications

Universal Bounds on Fluctuations in Continuous Thermal Machines

Universal Bounds on Fluctuations in Continuous Thermal Machines

Influence of Environmental Fluctuations on Quantum Interference in Naphthalene and Azulene

Configuration-specific insight to single-molecule conductance and noise data revealed by principal component projection method

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