Fundamental quantum noise mapping with tunnelling microscopes tested at surface structures of subatomic lateral size

Herz, Markus; Bouvron, Samuel; Cavar, Elizabeta; Fonin, Mikhail; Belzig, Wolfgang; Scheer, Elke

doi:10.1039/c3nr02216a

Cited by 15 publications

(14 citation statements)

References 37 publications

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“…[8]. As to atomic scale structures, some results for the tunneling range (conductance G ≲ 0.043 G 0 , G 0 ¼ 2e 2 =h) have been reported from STM studies [9][10][11]. In break junctions shot noise has been investigated for atomic Au [6,7,12], Al [13], and Pt [14] contacts with G ≳ G 0 as well as for benzene [15].…”

Section: Shot Noise As a Probe Of Spin-polarized Transport Through Simentioning

confidence: 99%

Shot Noise as a Probe of Spin-Polarized Transport through Single Atoms

et al. 2015

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Section: Shot Noise As a Probe Of Spin-polarized Transport Through Simentioning

confidence: 99%

Shot Noise as a Probe of Spin-Polarized Transport through Single Atoms

et al. 2015

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“…All electrical measurements are performed at room temperature in liquid environment. The conductance measurements of stretching and relaxing were performed by using a custom-built logarithmic amplifier [ 48 – 49 ].The I – V curves have been recorded by a sub-femtoamp source-meter (Keithley 6430) operating with an automatic variable gain pre-amplifier. The voltage has been swept usually at a rate of 100 mV/s.…”

Section: Methodsmentioning

confidence: 99%

Role of solvents in the electronic transport properties of single-molecule junctions

Luka-Guth¹,

Hambsch²,

Bloch³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryWe report on an experimental study of the charge transport through tunnel gaps formed by adjustable gold electrodes immersed into different solvents that are commonly used in the field of molecular electronics (ethanol, toluene, mesitylene, 1,2,4-trichlorobenzene, isopropanol, toluene/tetrahydrofuran mixtures) for the study of single-molecule contacts of functional molecules. We present measurements of the conductance as a function of gap width, conductance histograms as well as current–voltage characteristics of narrow gaps and discuss them in terms of the Simmons model, which is the standard model for describing transport via tunnel barriers, and the resonant single-level model, often applied to single-molecule junctions. One of our conclusions is that stable junctions may form from solvents as well and that both conductance–distance traces and current–voltage characteristics have to be studied to distinguish between contacts of solvent molecules and of molecules under study.

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“…Alongside mesoscopic measurements, molecules and atomic-scale structures have also been studied [28][29][30][31][32][33][34], mainly by means of mechanically controlled break junctions. More recently a few experimental groups demonstrated local shot noise measurements using a scanning tunneling microscope (STM) [7,8,14,17,[35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Shot-noise measurements of single-atom junctions

Tamir,

Caspari,

Rolf

et al. 2021

Preprint

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Current fluctuations related to the discreteness of charge passing through small constrictions are termed shot noise. This unavoidable noise provides both advantages -being a direct measurement of the transmitted particles' charge, and disadvantages -a main noise source in nanoscale devices operating at low temperature. While better understanding of shot noise is desired, the technical difficulties in measuring it result in relatively few experimental works, especially in single-atom structures. Here we describe a local shot-noise measurement apparatus, and demonstrate successful noise measurements through single-atom junctions. Our apparatus, based on a scanning tunneling microscope operates at liquid helium temperatures. It includes a broadband commercial amplifier mounted in close proximity to the tunnel junction, thus reducing both thermal noise and the input capacitance that limit traditional noise measurements. The full capabilities of the microscope are maintained in the modified system and a quick transition between different measurement modes is possible.

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Fundamental quantum noise mapping with tunnelling microscopes tested at surface structures of subatomic lateral size

Cited by 15 publications

References 37 publications

Shot Noise as a Probe of Spin-Polarized Transport through Single Atoms

Shot Noise as a Probe of Spin-Polarized Transport through Single Atoms

Role of solvents in the electronic transport properties of single-molecule junctions

Shot-noise measurements of single-atom junctions

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