Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8257
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dc.contributor.authorRevathy, B.S.-
dc.contributor.authorSharma, Harsh-
dc.contributor.authorDivakaran, Uma-
dc.date.accessioned2024-05-13T08:45:04Z-
dc.date.available2024-05-13T08:45:04Z-
dc.date.issued2024-04-05-
dc.identifier.citationJournal of Physics : Mathematical and Theoretical, 2024, Vol. 57, p165302en_US
dc.identifier.urihttp://hdl.handle.net/2289/8257-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractThe efficiency of a quantum heat engine is maximum when the unitary strokes of the quantum Otto cycle are adiabatic. On the other hand, this may not be always possible due to small energy gaps in the system, especially at the critical point (CP) where the gap between the ground state and the first excited state vanishes and the system gets excited. With the aim to regain this lost adiabaticity, we modify one of the unitary strokes of the Otto cycle by allowing the system to first evolve with a time dependent Hamiltonian as in the case of a usual Otto cycle, followed by an additional evolution with a different time independent Hamiltonian so that the system reaches a less excited state. This will help in increasing the magnitude of the heat absorbed from the hot bath so that the work output and efficiency of the engine can be increased. We demonstrate this method using an integrable model and a non-integrable model as the working medium and discuss the generality and limitations of this method. In the case of a two spin system, the optimal value for the time till which the system needs to be freely evolved is calculated analytically in the adiabatic limit. The results show that implementing this modified unitary stroke significantly improves the work output and efficiency of the engine, especially when it crosses the CP.en_US
dc.language.isoenen_US
dc.publisherIOP Publishing Ltd.en_US
dc.relation.urihttps://arxiv.org/abs/2302.07003en_US
dc.relation.urihttp://dx.doi.org/10.1088/1751-8121/ad38eeen_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2023arXiv230207003S/abstracten_US
dc.rights2024 IOP Publishing Ltden_US
dc.titleImproving performance of quantum heat engines using modified Otto cycleen_US
dc.typeArticleen_US
Appears in Collections:Research Papers (TP)

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