Particle-exchange heat engine working between bosonic and fermionic reservoirs

Jia, Beike

doi:10.1103/physreve.83.062104

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…22 There are also theoretical proposals for threereservoir heat engines where the electrons are driven by a coupling to a phonon bath. 23,24 A significant advantage of the photonic coupling compared to Coulombic or phononic interaction is that the two parts of the circuit with different temperatures can be located arbitrarily far apart. One can imagine a scenario where the external circuit is a relatively large device which performs some useful function but at the same time produces excess heat.…”

Section: Introductionmentioning

confidence: 99%

Theory of single-electron heat engines coupled to electromagnetic environments

Ruokola

Ojanen

2012

Phys. Rev. B

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We introduce a new class of mesoscopic heat engines consisting of a tunnel junction coupled to a linear thermal bath. Work is produced by transporting electrons up against a voltage bias like in ordinary thermoelectrics but heat is transferred by microwave photons, allowing the heat bath to be widely separated from the electron system. A simple and generic formalism capable of treating a variety of different types of junctions and environments is presented. We identify the systems and conditions required for maximal efficiency and maximal power. High efficiencies are possible with quantum dot arrays but high power can be achieved also with metallic systems.

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Section: Introductionmentioning

confidence: 99%

Theory of single-electron heat engines coupled to electromagnetic environments

Ruokola

Ojanen

2012

Phys. Rev. B

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Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material

Fan

Hagihala

et al. 2020

New J. Phys.

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Thermoelectric material SnSe has aroused world-wide interests in the past years, and its inherent strong lattice anharmonicity is regarded as a crucial factor for its outstanding thermoelectric performance. However, the understanding of lattice anharmonicity in SnSe system remains inadequate, especially regarding how phonon dynamics are affected by this behavior. In this work, we present a comprehensive study of lattice dynamics on Na0.003Sn0.997Se0.9S0.1 by means of neutron total scattering, inelastic neutron scattering, Raman spectroscopy as well as frozen-phonon calculations. Lattice anharmonicity is evidenced by pair distribution function, inelastic neutron scattering and Raman measurements. By separating the effects of thermal expansion and multi-phonon scattering, we found that the latter is very significant in high-energy optical phonon modes. The strong temperature-dependence of these phonon modes indicate the anharmonicity in this system. Moreover, our data reveals that the linewidths of high-energy optical phonons become broadened with mild doping of sulfur. Our studies suggest that the thermoelectric performance of SnSe could be further enhanced by reducing the contributions of high-energy optical phonon modes to the lattice thermal conductivity via phonon engineering.

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Hopping thermoelectric transport in finite systems: Boundary effects

2013

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It is shown that for the hopping regime, the thermopowers in both finite two-terminal and threeterminal systems are governed by the edges of the samples. This is due to the fact that the energy transfer between a transport electron and a conducting terminal is determined by the site most strongly coupled to that terminal. One-dimensional systems with both nearest-neighbor and variable-range transport as well as certain types of two-dimensional systems, are considered. For a given sample, the changes in the thermopowers due to modifying the bulk are quite limited, compared with those of the conductance. When the small thermopower changes exist, their average over a large ensemble of mesoscopic samples will vanish. We also obtain the distribution of the thermopower in such an ensemble and show that its width approaches a finite limit with increasing sample length. This contrasts with the distribution of conductances in such systems, whose width vanishes in the long sample limit. Finally, we find that the thermal conductances in the three-terminal case have a boundary-dominated contribution, due to non-percolating conduction paths. This contribution can become dominant when the usual conductance is small enough. All our theoretical statements are backed by numerical computations.

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Particle-exchange heat engine working between bosonic and fermionic reservoirs

Cited by 7 publications

References 25 publications

Theory of single-electron heat engines coupled to electromagnetic environments

Theory of single-electron heat engines coupled to electromagnetic environments

Strong lattice anharmonicity exhibited by the high-energy optical phonons in thermoelectric material

Hopping thermoelectric transport in finite systems: Boundary effects

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