Quantum Otto heat engine based on a multiferroic chain working substance

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Azimi, M.; Chotorlishvili, L.; Mishra, S.K.; Vekua, T.; Hübner, W.; et al.: Quantum Otto heat engine based on a multiferroic chain working substance. In: New Journal of Physics 16 (2014), 63018. DOI: https://doi.org/10.1088/1367-2630/16/6/063018

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We study a quantum Otto engine operating on the basis of a helical spin-1/2 multiferroic chain with strongly coupled magnetic and ferroelectric order parameters. The presence of a finite spin chirality in the working substance enables steering of the cycle by an external electric field that couples to the electric polarization. We observe a direct connection between the chirality, the entanglement and the efficiency of the engine. An electric-field dependent threshold temperature is identified, above which the pair correlations in the system, as quantified by the thermal entanglement, diminish. In contrast to the pair correlations, the collective many-body thermal entanglement is less sensitive to the electric field, and in the high temperature limit converges to a constant value. We also discuss the correlations between the threshold temperature of the pair entanglement, the spin chirality and the minimum of the fidelities in relation to the electric and magnetic fields. The efficiency of the quantum Otto cycle shows a saturation plateau with increasing electric field amplitude.
License of this version: CC BY 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 87 78.38%
2 image of flag of China China 4 3.60%
3 image of flag of United States United States 3 2.70%
4 image of flag of Morocco Morocco 2 1.80%
5 image of flag of Italy Italy 2 1.80%
6 image of flag of Pakistan Pakistan 1 0.90%
7 image of flag of Korea, Republic of Korea, Republic of 1 0.90%
8 image of flag of United Kingdom United Kingdom 1 0.90%
9 image of flag of France France 1 0.90%
10 image of flag of Austria Austria 1 0.90%
    other countries 8 7.21%

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