Related papers: Improving Performance of Quantum Heat Engines using modified Otto cycle

Improving Performance of Quantum Heat Engines using modified Otto cycle

URL: http://arxiv.org/abs/2302.07003v2
Date: Fri, 5 Jul 2024 09:15:17 GMT
Title: Improving Performance of Quantum Heat Engines using modified Otto cycle
Authors: Revathy B. S, Harsh Sharma, Uma Divakaran,
Abstract summary: We modify one of the unitary strokes of the cycle by allowing the system to evolve freely with a particular Hamiltonian till a time. 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.
Score: 0.6554326244334868
License: http://creativecommons.org/licenses/by/4.0/
Abstract: The efficiency of a quantum heat engine is maximum when the unitary strokes 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 where the gap vanishes. With the aim to achieve this adiabaticity, we modify one of the unitary strokes of the cycle by allowing the system to evolve freely with a particular Hamiltonian till a time 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. 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 stroke significantly improves the work output and efficiency of the engine, especially when it crosses the critical point.

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