The In-Gap Charge Current through the Correlated Quantum Dot Hybridized with Superconductor

Donabidowicz, A.; Domański, T.

doi:10.12693/aphyspola.114.75

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…This choice of parameters corresponds to the time-independent Schrieffer-Wolff transformation introduced in [101] and such transformation can be applied to the Hamiltonian of the system at t ≤ 0, since φ(t) = 0 in this interval.…”

Section: Discussionmentioning

confidence: 99%

The distribution of work performed on a NIS junction

2016

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We propose an experimental setup to measure the work performed in a normal-metal/insulator/ superconducting (NIS) junction, subjected to a voltage change and in contact with a thermal bath. We compute the performed work and argue that the associated heat release can be measured experimentally. Our results are based on an equivalence between the dynamics of the NIS junction and that of an assembly of two-level systems subjected to a circularly polarised field, for which we can determine the work-characteristic function exactly. The average work dissipated by the NIS junction, as well as its fluctuations, are determined. From the work characteristic function, we also compute the work probability-distribution and show that it does not have a Gaussian character. Our results allow for a direct experimental test of the Crooks-Tasaki fluctuation relation.

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Section: Discussionmentioning

confidence: 99%

The distribution of work performed on a NIS junction

2016

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Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor

Barański¹,

Zienkiewicz²,

Barańska³

et al. 2020

Sci Rep

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We analyze the influence of a local pairing on the quantum interference in nanoscopic systems. As a model system we choose the double quantum dot coupled to one metallic and one superconducting electrode in the T-shape geometry. The analysis is particularly valuable for systems containing coupled objects with considerably different broadening of energy levels. In such systems, the scattering of itinerant electrons on a discrete (or narrow) energy level gives rise to the Fano-type interference. Systems with induced superconducting order, along well understood Fano resonances, exhibit also another features on the opposite side of the Fermi level. The lineshape of these resonances differs significantly from their reflection on the opposite side of the Fermi level, and their origin was not fully understood. Here, considering the spin-polarized tunneling model, we explain a microscopic mechanism of a formation of these resonances and discuss the nature of their uncommon lineshapes. We show that the anomalous Fano profiles originate solely from the pairing of nonscattered electrons with scattered ones. We investigate also the interplay of each type of resonances with the Kondo physics and discuss the resonant features in differential conductivity.

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Thermoelectric transport in the three terminal quantum dot

Wysokiński

2012

J. Phys.: Condens. Matter

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The thermoelectric transport in the system composed of a quantum dot in contact with superconducting, ferromagnetic and normal metal electrodes has been studied. Such a system can support pure spin current in the normal electrode. In the limit of a large superconducting gap and weak coupling between the dot and the electrodes we investigate the sub-gap charge and spin transport via Andreev mechanism using the standard master equation technique, which is known to be valid in the sequential tunnelling regime. The Zeeman splitting of the dot level induces pure spin current in the ferromagnetic electrode under an appropriate bias. This opens a novel possibility to switch the spin current between two electrodes by electric means. The calculated spin and charge thermopower coefficients attain very large values, of the order of a few hundreds μV K(-1), and show similar dependences on the position of the on-dot energy level and temperature.

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The In-Gap Charge Current through the Correlated Quantum Dot Hybridized with Superconductor

Cited by 3 publications

References 12 publications

The distribution of work performed on a NIS junction

The distribution of work performed on a NIS junction

Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor

Thermoelectric transport in the three terminal quantum dot

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