Cycle Flux Ranking of Network Analysis in Quantum Thermal Devices

Wang, Luqin; Wang, Zi; Wang, Chen; Ren, Jie

doi:10.1103/physrevlett.128.067701

Cited by 20 publications

(6 citation statements)

References 85 publications

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“…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

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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 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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Section: Introductionmentioning

confidence: 77%

Nonlocal quantum heat engines made of hybrid superconducting devices

et al. 2022

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“…Future extensions include the smooth and continuous temperature variation, macroscopic version of GTEP effect in bulk materials, thermo-spin conversion and pumping, [48][49][50][51] and complex-network-based thermal energy conversion, [52] where more detailed power and efficiency analysis should be desired. Also, exploring the geometric-phase-induced pumping effect in spatiotemporal metamaterials will be of great potential interest.…”

Section: Seebeck Effectmentioning

confidence: 99%

Geometric Thermoelectric Pump: Energy Harvesting beyond Seebeck and Pyroelectric Effects

Ren

2023

Chinese Phys. Lett.

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Thermal-electric conversion is crucial for smart energy control and harvesting, such as thermal sensing and waste heat recovering. So far, people are aware of two main ways of direct thermal-electric conversion, Seebeck and pyroelectric effects, each with different working mechanisms, conditions and limitations. Here, we report the concept of “Geometric Thermoelectric Pump”, as the third way of thermal-electric conversion beyond Seebeck and pyroelectric effects. In contrast to Seebeck effect that requires spatial temperature difference, Geometric Thermoelectric Pump converts the time-dependent ambient temperature fluctuation into electricity. Moreover, Geometric Thermoelectric Pump does not require polar materials but applies to general conducting systems, thus is also distinct from pyroelectric effect. We demonstrate that Geometric Thermoelectric Pump results from the temperature-fluctuation-induced charge redistribution, which has a deep connection to the topological geometric phase in non-Hermitian dynamics, as a consequence of the fundamental nonequilibrium thermodynamic geometry. The findings advance our understanding of geometric phase induced multiple-physicscoupled pump effect and provide new means of thermal-electric energy harvesting.

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“…Heat engines should ideally have good performance in finite time [ 1 , 2 , 3 , 4 , 5 , 6 ], and operate stably [ 7 , 8 , 9 , 10 ] by exhibiting small fluctuations. Quantum heat engines [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] were observed to operate with novel performance beyond their classical counterparts. These devices with a limited number of freedoms are exposed to not only thermal fluctuations, but also quantum fluctuations related to discrete energy spectra [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of Quantum Heat Engines Enhanced by Adiabatic Deformation of Trapping Potential

Xiao

et al. 2023

Entropy

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We present a quantum Otto engine model alternatively driven by a hot and a cold heat reservoir and consisting of two isochoric and two adiabatic strokes, where the adiabatic expansion or compression is realized by adiabatically changing the shape of the potential. Here, we show that such an adiabatic deformation may alter operation mode and enhance machine performance by increasing output work and efficiency, even with the advantage of decreasing work fluctuations. If the heat engine in the sudden limit operates under maximal power by optimizing the control parameter, the efficiency shows certain universal behavior, η*=ηC/2+ηC2/8+O(ηC3), where ηC=1−βhr/βcr is the Carnot efficiency, with βhr(βcr) being the inverse temperature of the hot (cold) reservoir. However, such efficiency under maximal power can be produced by our machine model in the regimes where the machine without adiabatic deformation can only operate as a heater or a refrigerator.

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Cycle Flux Ranking of Network Analysis in Quantum Thermal Devices

Cited by 20 publications

References 85 publications

Nonlocal quantum heat engines made of hybrid superconducting devices

Nonlocal quantum heat engines made of hybrid superconducting devices

Geometric Thermoelectric Pump: Energy Harvesting beyond Seebeck and Pyroelectric Effects

Performance of Quantum Heat Engines Enhanced by Adiabatic Deformation of Trapping Potential

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