Abstract
We examine a quantum Otto engine using both Bose–Einstein condensation (BEC) and normal Bose gas as working medium trapped in generalized external potential. We treated the engine quasi-statically and endoreversibly. Since the expansion and compression in both quasi-static and endoreversible take place isentropic, the expression of efficiency is similar. However, the power output in the quasi-static cycle is zero due to infinite and long stroke time. In contrast, with an endoreversible cycle, thermalization with two reservoirs takes place at a finite time. We use Fourier’s law of conduction to formulate the relation between temperature of medium and reservoir, making work depend on heating and cooling stroke time. Moreover, we maximized the power with respect to compression ratio \(\kappa\) to obtain efficiency at maximum power (EMP). We found that EMP is significantly higher when using BEC as a working medium; meanwhile, EMP with normal Bose gas is just Curzon–Ahlborn efficiency. We also investigate the effect of thermal contact time \(\tau\) with hot \((\tau _{h})\) and cold \((\tau _{l})\) reservoir on EMP. We found that when complete thermalization, \(\tau _{h}=\tau _{l}\), stroke time occurs, there are no significant differences. Nevertheless, while incomplete thermalization arises, adjusting various cooling and heating stroke time provides a significant result on EMP, which is much higher at \(\tau _{h}<\tau _{l}\) stroke time and lower at \(\tau _{h}>\tau _{l}\) stroke time. We conclude this incomplete thermalization leads to the condition where residual coherence emerges which enhances the EMP of the engine.
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Data Availability Statement
This manuscript has no associated data. [Authors’ comment: All data generated or analyzed during this study are included in this published article].
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TEPS thanks the Faculty of Mathematics and Natural Sciences, Andalas University, for financially supporting this research with research Grant No. 04/UN.16.03.D/PP/FMIPA/2022.
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Zettira, Z., Fahriza, A., Abdullah, Z. et al. Enhancing quantum Otto engine performance in generalized external potential on Bose–Einstein condensation regime. Eur. Phys. J. Plus 139, 282 (2024). https://doi.org/10.1140/epjp/s13360-024-05051-z
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DOI: https://doi.org/10.1140/epjp/s13360-024-05051-z