Electronic noise due to temperature differences in atomic-scale junctions

Shein-Lumbroso, Ofir; Simine, Lena; Nitzan, Abraham; Segal, Dvira; Tal, Oren

doi:10.1038/s41586-018-0592-2

Cited by 87 publications

(119 citation statements)

References 32 publications

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“…50 Finally, temperature differences across atomic and molecular junctions introduce an additional source of fluctuations as was recently revealed in Ref. 24 The structure of the transmission function further influences this type of noise and it will be analyzed in details in a separate publication.…”

Section: Discussionmentioning

confidence: 92%

“…Noise measurements are performed on the atomic junctions using a dedicated circuit. 24 To measure noise on atomic junctions, the sample is disconnected from the conductance measurement circuit and connected to the dedicated circuit using switches. The sample is current-biased by a Yokogawa GS200 SC voltage source connected to the sample through two 0.5MΩ resistors located in proximity to the sample.…”

Section: Methodsmentioning

confidence: 99%

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Origin of the Anomalous Electronic Shot Noise in Atomic-Scale Junctions

Shein-Lumbroso

Tal

et al. 2019

J. Phys. Chem. C

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Fluctuations pose fundamental limitations in making sensitive measurements, yet at the same time, noise unravels properties that are inaccessible at the level of the averaged signal. In electronic devices, shot noise arises from the discrete nature of charge carriers and it increases linearly with the applied voltage according to the celebrated Schottky formula. Nonetheless, measurements of shot noise in atomic-scale junctions at high voltage reveal significant nonlinear (anomalous) behavior, which varies from sample to sample, and has no specific trend. Here, we provide a viable, unifying explanation for these diverse observations based on the theory of quantum coherent transport.Our formula for the anomalous shot noise relies on-and allows us to resolve-two key characteristics of a conducting junction: The structure of the transmission function at the vicinity of the Fermi energy and the asymmetry of the bias voltage drop at the contacts. We tested our theory on high voltage shot noise measurements on Au atomic scale junctions and demonstrated a quantitative agreement, recovering both the enhancement and suppression of shot noise as observed in different junctions. The good theory-experiment correspondence supports our modelling and emphasizes that the asymmetry of the bias drop on the contacts is a key factor in nanoscale electronic transport, which may substantially impact electronic signals even in incomplex structures.

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Section: Discussionmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Origin of the Anomalous Electronic Shot Noise in Atomic-Scale Junctions

Shein-Lumbroso

Tal

et al. 2019

J. Phys. Chem. C

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“…Note that there are several contributions to the noise in setups like this, namely an equilibrium contribution due to finite temperatures, a non-equilibrium contribution due to a temperature gradient and, additionally, a contribution due to the thermoelectrically created nonlocal charge current. The interplay of these sources of fluctuations has been carefully studied in [73]. In Fig.…”

Section: (S 3)mentioning

confidence: 99%

“…We provide more details on the T 0 -dependence of the noise in the supplemental material [62]. Recently, the electronic noise due to temperature differences in mesoscopic conductors, different than thermal or shot noise, was measured and proposed as an accurate temperature probe [73].…”

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confidence: 99%

On-demand thermoelectric generation of equal-spin Cooper pairs

Keidel

Hwang

Trauzettel

et al. 2020

Phys. Rev. Research

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Superconducting spintronics is based on the creation of spin-triplet Cooper pairs in ferromagnetsuperconductor (F-S) hybrid junctions. Previous proposals to manipulate spin-polarized supercurrents on-demand typically require the ability to carefully control magnetic materials. We, instead, propose a quantum heat engine that drives equal-spin supercurrents on-demand without the need for manipulating magnetic components. We consider a S-F-S junction, connecting two leads at different temperatures, on top of the helical edge of a two-dimensional topological insulator. The heat and charge currents generated by the thermal bias are caused by different transport processes, where electron cotunneling is responsible for the heat flow to the cold lead and, strikingly, only crossed Andreev reflections contribute to the charge current. Such a purely nonlocal Andreev thermoelectric effect generates a spin-polarized supercurrent between the superconductors that can be switched on/off by tuning their relative phase. We further demonstrate that the detection of the spin-triplet supercurrent is facilitated by rather low fluctuations of the thermoelectric current for temperature gradients comparable to the superconducting gap. arXiv:1907.00965v2 [cond-mat.mes-hall]

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“…36,37 In addition, a recent measurement of thermal gradient induced particle noise was reported in the literature. 38 In the linear regime, quantum coherence universally weakens heat engine performance, 39 and reductions in power and efficiency have also been reported in nonlinear quantum heat engines. 40 However, there is no comprehensive answer to the question of whether quantum effects improve or reduce the performance of nonlinear heat engines at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Numerically exact full counting statistics of the energy current in the Kondo regime

et al. 2019

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We use the inchworm Quantum Monte Carlo method to investigate the full counting statistics of particle and energy currents in a strongly correlated quantum dot. Our method is used to extract the heat fluctuations and entropy production of a quantum thermoelectric device, as well as cumulants of the particle and energy currents. The energy-particle current cross correlations reveal information on the preparation of the system and the interplay of thermal and electric currents. We furthermore demonstrate the signature of a crossover from Coulomb blockade to Kondo physics in the energy current fluctuations, and show how the conventional master equation approach to full counting statistics systematically fails to capture this crossover.

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Electronic noise due to temperature differences in atomic-scale junctions

Cited by 87 publications

References 32 publications

Origin of the Anomalous Electronic Shot Noise in Atomic-Scale Junctions

Origin of the Anomalous Electronic Shot Noise in Atomic-Scale Junctions

On-demand thermoelectric generation of equal-spin Cooper pairs

Numerically exact full counting statistics of the energy current in the Kondo regime

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