Coulomb Thermoelectric Drag in Four-Terminal Mesoscopic Quantum Transport

Xi, Mengmeng; Wang, Rongqian; Lu, Jincheng; Chen, Teng-Yun; Jiang, Jian‐Hua

doi:10.1088/0256-307x/38/8/088801

Cited by 11 publications

(8 citation statements)

References 71 publications

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“…Differently from extended samples, that rely on momentum exchange [85], the mesoscopic drag is based on the exchange of energy. 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.…”

Section: Introductionmentioning

confidence: 77%

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: Introductionmentioning

confidence: 77%

Nonlocal quantum heat engines made of hybrid superconducting devices

Tabatabaei,

Sanchez,

Yeyati

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Heat injected from the hot reservoir (H) induces the transfer of either (a) a Cooper pair in the superconductor (S) via an Andreev reflection in the normal lead (N), or (b) a quasiparticle transferred between S and N. In both cases, an electric current is generated in the passive subsystem. in the drive system [89][90][91][92][93][94][95][96][97][98] and of absorption refrigerators [99]. In a recent work [100], 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 electrode.…”

Section: Introductionmentioning

confidence: 77%

Nonlocal quantum heat engines made of hybrid superconducting devices

et al. 2022

View full text Add to dashboard Cite

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 electronelectron 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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“…5(a). The system consists of an hybrid quantum system (e.g., four QDs): QDs 1 and 2 with the energies E 1 and E 2 in the upper channel are coupled with the hot phononic reservoir H, while QDs 3 and 4 in the lower channel with energy E 3 and E 4 are coupled with the cold phononic bath C. The inelastic-scattering processes can lead to thermoelectric transport [82,83]. I i p (i = L, R) is the particle current flowing from the reservoir i into system and I i Q (i = L, R, H, C) is the heat current flows from the reservoir i into the system.…”

Section: The Four-terminal Thermoelectric Qd Systemsmentioning

confidence: 99%

“…, it is convenient to discover a mode of cooling by transverse heat current effect: the coolest right reservoir can be cooled by passing a heat current between the H phonon bath and the C phonon bath, with no energy exchange between the phonon and electronic reservoirs [81,83]. Obviously, the cooling by thermal current operation requires a higher temperature of phonon bath than the cooling by electric power.…”

Section: The Four-terminal Thermoelectric Qd Systemsmentioning

confidence: 99%

Multitask quantum thermal machines and cooperative effects

Lu¹,

Wang²,

Wang³

et al. 2022

Preprint

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The performance of nonequilibrium work extraction in thermoelectric devices can be enhanced by introducing the phonon-assisted inelastic process. Herein, we study phonon-thermoelectric devices where particle current and phononic heat currents are coupled by dominating phonon-assisted inelastic process and fueled by chemical potential difference and temperature biases and show that inelastic thermoelectric setups have a much richer functionality diagram and can even simultaneously perform multiple tasks, such as heat engines, refrigerators, and heat pumps. From the viewpoint of entropy production, we study the efficiencies and coefficients of performance of multi-task quantum thermal machines by analyzing two typical thermoelectric devices and emphasize the role of the inelastic scattering process and multiple biases in multiterminal setups. In a three-terminal double-quantum-dot setup with a tunable gate, we show that it performs two useful tasks due to the phonon-assisted inelastic process dominating the transport. For four-terminal four-quantum-dot thermoelectric device, we demonstrate that additional thermodynamic affinity furnishes the system with both substantially enriched functionality diagrams and enhanced efficiency. The cooperation between the longitudinal and transverse thermoelectric effects in the three-terminal thermoelectric systems leads to markedly improved performance of the thermal machines. Our work provides insights into optimizing general thermoelectric devices.

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Coulomb Thermoelectric Drag in Four-Terminal Mesoscopic Quantum Transport

Cited by 11 publications

References 71 publications

Nonlocal quantum heat engines made of hybrid superconducting devices

Nonlocal quantum heat engines made of hybrid superconducting devices

Nonlocal quantum heat engines made of hybrid superconducting devices

Multitask quantum thermal machines and cooperative effects

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