Scaling of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mi>f</mml:mi></mml:math>noise in tunable break junctions

Wu, ZhengMing; Wu, Songmei; Oberholzer, S.; Steinacher, M.; Calame, Michel; Schönenberger, Christian

doi:10.1103/physrevb.78.235421

Cited by 27 publications

(50 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fano factor in the high conductance, high bias regime is approximately a third of that in the G < G 0 tunneling regime. At the conductances where noise is relatively suppressed, the bias scaling of the averaged noise is consistent with conductance fluctuations, and the magnitude is not unreasonable considering previous experiments [27]. These experiments are performed using a scanning tunneling microscope (STM)-style break junction, as has become very popular in the study of molecular conduction [28,29].…”

mentioning

confidence: 71%

“…with power ν ranging between 1 ∼ 2, we compared our inferred magnitude of A with values observed at lower frequencies and higher junction conductances in other gold point contacts by Wu et al [27]. The result depends strongly on the assumed value of ν, which is expected to fall between 1 (traditional 1/f noise) and 2 (expected for a single two-level fluctuator [27]).…”

mentioning

confidence: 87%

“…This nonlinearity is only clearly seen at conductances where the noise is relatively suppressed. A natural explanation for this is a contribution to the measured noise from conductance fluctuations, commonly termed "flicker" noise, which often has (in macroscale systems) a 1/f frequency dependence [27]. Such flicker noise, originating with fluctua tions in the actual junction resistance, should scale quadratically with voltage across the junction at a given conductance, when recast as voltage fluctuations.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Excess noise in STM-style break junctions at room temperature

2012

View full text Add to dashboard Cite

Current noise in nanoscale systems provides additional information beyond the electronic conductance. We report measurements at room temperature of the nonequilibrium "excess" noise in ensembles of atomic-scale gold junctions repeatedly formed and broken between a tip and a film, as a function of bias conditions. We observe suppression of the noise near conductances associated with conductance quantization in such junctions, as expected from the finite temperature theory of shot noise in the limit of few quantum channels. In higher conductance junctions, the Fano factor of the noise approaches 1/3 the value seen in the low conductance tunneling limit, consistent with theoretical expectations for the approach to the diffusive regime. At conductance values where the shot noise is comparatively suppressed, there is a residual contribution to the noise that scales quadratically with the applied bias, likely due to a flicker noise/conductance fluctuation mechanism.

show abstract

mentioning

confidence: 71%

mentioning

confidence: 87%

mentioning

confidence: 99%

See 1 more Smart Citation

Excess noise in STM-style break junctions at room temperature

2012

View full text Add to dashboard Cite

show abstract

“…The mechanisms of charge transport and low-frequency noise behavior in thin metal films and nanowires as well as in discontinuous metal films have been the objects of numerous investigations over the course of several decades. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] However, transport and noise measurements of molecular systems involving metal-molecule junctions are still challenging. It was shown that some thiolterminated molecular junctions can exhibit very high random telegraph signal (RTS) noise levels.…”

mentioning

confidence: 99%

Noise spectroscopy of tunable nanoconstrictions: molecule-free and molecule-modified

Handziuk

Gasparyan

Vandamme³

et al. 2018

Nanotechnology

View full text Add to dashboard Cite

Devices with metallic nanoconstrictions functionalized by organic molecules are promising candidates for the role of functional devices in molecular electronics. However, at the moment little is known about transport and noise properties of nanoconstriction devices of this kind. In this paper, transport properties of bare gold and molecule-containing tunable cross-section nanoconstrictions are studied using low-frequency noise spectroscopy. Normalized noise power spectral density (PSD) S /I dependencies are analyzed for a wide range of sample resistances R from 10 Ohm to 10 MOhm. The peculiarities and physical background of the flicker noise behavior in the low-bias regime are studied. It is shown that modification of the sample surface with benzene-1,4-dithiol molecules results in a decrease of the normalized flicker noise spectral density level in the ballistic regime of sample conductance. The characteristic power dependence of normalized noise PSD as a function of system resistance is revealed. Models describing noise behavior for bare gold and BDT modified samples are developed and compared with the experimental data for three transport regimes: diffusive, ballistic and tunneling. Parameters extracted from models by fitting are used for the characterization of nanoconstriction devices.

show abstract

“…For larger aggregates, discrete variation in conductance is no longer visible, probably hidden by conductance fluctuations larger than the contribution of a single molecule. While quantitative noise analysis is far beyond the scope of this article, the measurement technique we detailed here opens the way to such studies on nanocontacts of tunable cross section, which are rarely reported [35]. Its use promises new insights into the dynamic and transport mechanisms of nanometric-sized molecular contacts at room temperature.…”

Section: Discussionmentioning

confidence: 99%

Estimating single molecule conductance from spontaneous evolution of a molecular contact

Gil

Malinowski

Iazykov

et al. 2018

Journal of Applied Physics

View full text Add to dashboard Cite

We present an original method to estimate the conductivity of a single molecule anchored to nanometric-sized metallic electrodes, using a Mechanically Controlled Break Junction (MCBJ) operated at room temperature in liquid. We record the conductance through the metal / molecules / metal nanocontact while keeping the metallic electrodes at a fixed distance. Taking advantage of thermal diffusion and electromigration, we let the contact naturally explore the more stable configurations around a chosen conductance value. The conductance of a single molecule is estimated from a statistical analysis of raw conductance and conductance standard deviation data for molecular contacts containing up to 14 molecules. The single molecule conductance values are interpreted as time-averaged conductance of an ensemble of conformers at thermal equilibrium. arXiv:1706.09818v2 [cond-mat.mes-hall]

show abstract

Scaling of1∕fnoise in tunable break junctions

Cited by 27 publications

References 52 publications

Excess noise in STM-style break junctions at room temperature

Excess noise in STM-style break junctions at room temperature

Noise spectroscopy of tunable nanoconstrictions: molecule-free and molecule-modified

Estimating single molecule conductance from spontaneous evolution of a molecular contact

Contact Info

Product

Resources

About