The Carnot efficiency enabled by complete degeneracies

Su, Shanhe; Zhang, Yanchao; Su, Guozhen; Chen, Jincan

doi:10.1016/j.physleta.2018.05.042

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…While the extracted work and efficiency depend on the working media in a quantum heat engine, these properties are indifferent to the working media used in a classical heat engine. Different quantum mechanical working media, for instance, spin systems [5,20], particle in a box [13,21], and harmonic oscillators [22][23][24][25], have already been employed in designing quantum heat engines.…”

Section: Introductionmentioning

confidence: 99%

“…In this article, we strive to construct a quantum heat engine whose working principle is exclusively based on the quantum features of formation of quantized energy levels and quantum degeneracies [13,21,26], owing to the finite boundary conditions [27]. In this endeavour, we first propose a quantum Stirling heat engine based on an ensemble of quantum harmonic oscillators, where the degeneracy is generated by inserting a barrier in the middle of the harmonic oscillator.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependent maximization of work and efficiency in a degeneracy assisted quantum Stirling heat engine

Chatterjee,

Koner,

Chatterjee

et al. 2020

Preprint

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We propose a quantum Stirling heat engine with an ensemble of harmonic oscillators as the working medium. We show that the efficiency of the harmonic oscillator quantum Stirling heat engine (HO-QSHE) at a given frequency can be maximized at a specific ratio of the temperatures of the thermal reservoirs. In the low temperature or equivalently high frequency limit of the harmonic oscillators, the efficiency of the HO-QSHE approaches the Carnot efficiency. Further, we analyse quantum Stirling heat engine with an ensemble of particle in box quantum systems as the working medium. Here both work and efficiency can be maximized at a specific ratio of temperatures of the thermal reservoirs. These studies will enable us to operate the quantum Stirling heat engines at its optimal performance. The theoretical study of the HO-QSHE would provide impetus for its experimental realisation, as most real systems can be approximated as harmonic oscillators for small displacements near equilibrium.

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