Andreev-Coulomb Drag in Coupled Quantum Dots

Tabatabaei, S. Mojtaba; Sánchez, David; Yeyati, A. Levy; Sánchez, Rafael

doi:10.1103/physrevlett.125.247701

Cited by 14 publications

(16 citation statements)

References 53 publications

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“…Similarly to Ref. [96], the passive system response occurs around the center of the stability diagram, where fluctuations of the charge of both dots are enhanced. However, while the drag current in Ref.…”

Section: Andreev Regimementioning

confidence: 55%

“…This has been emphasized in proposals of thermal drag currents where only heat flows in the drive system [86][87][88][89][90][91][92][93][94] and of absorption refrigerators [95]. In a recent work [96], we found that the interplay of charge fluctuations and Andreev reflection processes gives rise to a drag current when the passive system contains a superconducting elec- trode. These processes compete with a second mechanism due to single quasiparticle tunneling.…”

Section: Introductionmentioning

confidence: 78%

“…However, while the drag current in Ref. [96] is driven by nonequilibrium fluctuations created by a dc bias applied across 3 the active dot, the generated current here is driven by purely thermal means.…”

Section: Andreev Regimementioning

confidence: 88%

“…Then it is important to take into account the contributions from both Andreev and quasiparticle transport mechanisms in the calculations. This is possible by employing the non-equilibrium Green's functions (NEGF) technique [96], which furthermore takes the finite linewidth of the quantum dot states (which is neglected in the sequential tunneling master equations discussed in previous sections) into account.…”

Section: Intermediate Regimementioning

confidence: 99%

See 3 more Smart Citations

Nonlocal quantum heat engines made of hybrid superconducting devices

Tabatabaei,

Sanchez,

Yeyati

et al. 2022

Preprint

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We discuss a quantum thermal machine that generates power from a thermally driven double quantum dot coupled to normal and superconducting reservoirs. Energy exchange between the dots is mediated by electron-electron interactions. We can distinguish three main mechanisms within the device operation modes. In the Andreev tunneling regime, energy flows in the presence of coherent superposition of zero-and two-particle states. Despite the intrinsic electron-hole symmetry of Andreev processes, we find that the heat engine efficiency increases with increasing coupling to the superconducting reservoir. The second mechanism occurs in the regime of quasiparticle transport.Here we obtain large efficiencies due to the presence of the superconducting gap and the strong energy dependence of the electronic density of states around the gap edges. Finally, in the third regime there exists a competition between Andreev processes and quasiparticle tunneling. Altogether, our results emphasize the importance of both pair tunneling and structured band spectrum for an accurate characterization of the heat engine properties in normal-superconducting coupled dot systems.

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Section: Andreev Regimementioning

confidence: 55%

Section: Introductionmentioning

confidence: 78%

Section: Andreev Regimementioning

confidence: 88%

Section: Intermediate Regimementioning

confidence: 99%

See 2 more Smart Citations

Nonlocal quantum heat engines made of hybrid superconducting devices

Tabatabaei,

Sanchez,

Yeyati

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several types of inelastic thermoelectric devices have been studied, involving, e.g., electron-phonon [36][37][38][39] or electron-electron interaction [37,[40][41][42][43][44][45][46][47][48]. In general, electron-phonon interaction is more important at high temperatures, whereas electron-electron interactions are important at very low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Coulomb Thermoelectric Drag in Four-Terminal Mesoscopic Quantum Transport

Xi¹,

Wang²,

Lu³

et al. 2021

Chinese Phys. Lett.

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We show that the Coulomb interaction between two circuits separated by an insulating layer leads to unconventional thermoelectric effects, such as the cooling by thermal current effect, the transverse thermoelectric effect and Maxwell’s demon effect. The first refers to cooling in one circuit induced by the thermal current in the other circuit. The middle represents electric power generation in one circuit by the temperature gradient in the other circuit. The physical picture of Coulomb drag between the two circuits is first demonstrated for the case with one quantum dot in each circuit and it is then elaborated for the case with two quantum dots in each circuit. In the latter case, the heat exchange between the two circuits can vanish. Finally, we also show that the Maxwell’s demon effect can be realized in the four-terminal quantum dot thermoelectric system, in which the quantum system absorbs the heat from the high-temperature heat bath and releases the same heat to the low-temperature heat bath without any energy exchange with the two heat baths. Our study reveals the role of Coulomb interaction in non-local four-terminal thermoelectric transport.

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Dynamic Exchange‐Correlation Effects on Coulomb Drag in Coupled Nanowires

Rani,

Garg,

Moudgil

2024

Physica Status Solidi (b)

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In this article, a study is done on the dynamic exchange‐correlation effects on Coulomb drag in coupled electron–electron (e–e) and electron–hole (e–h) nanowires fabricated on ‐based heterostructures. The drag rate is calculated over a wide range of temperature (T), particle number density parameter (), and inter‐wire separation (d) using the dynamic mean‐field theory of Hasegawa and Shimizu, known as the qSTLS theory. It is found that at a fixed T, the drag rate increases with an increase (or decrease) in (or d) and exhibits a peaked structure at sufficiently high T for both the coupled systems. The formation of peak in drag rate is explained by showing the variation of drag intensity function and dynamic local‐fields with T and . As anticipated, the drag is higher for the e–h nanowire system as compared to the e–e system due to stronger particle correlations in the former. It is asserted that the dynamics of particle correlations is crucial and more conspicuous at higher , leading to a significant reduction in drag compared to the STLS theory. Finally, the plasmon dispersion of both systems is reported and it is noted that there exist four plasma modes — two optic and two acoustic, and the energy of all modes shows a consistent blue shift with rise in T. However, as d is decreased, the uppermost optic and acoustic plasma modes seem to repel each other, while they gain in energy with an increase in in each of the coupled system.

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Andreev-Coulomb Drag in Coupled Quantum Dots

Cited by 14 publications

References 53 publications

Nonlocal quantum heat engines made of hybrid superconducting devices

Nonlocal quantum heat engines made of hybrid superconducting devices

Coulomb Thermoelectric Drag in Four-Terminal Mesoscopic Quantum Transport

Dynamic Exchange‐Correlation Effects on Coulomb Drag in Coupled Nanowires

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