Enhancement of efficiency in the Dicke model quantum heat engine

• URL: http://arxiv.org/abs/1906.00292v4
• Date: Tue, 17 Sep 2024 05:05:51 GMT
• Title: Enhancement of efficiency in the Dicke model quantum heat engine
• Authors: M. Aparicio Alcalde, E. Arias, N. F. Svaiter,
• Abstract summary: We analyze a quantum heat engine described by the full Dicke model. The relation between ground state degeneracy, related to the quantum phase transition, and maximum efficiency is investigated.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We analyze a quantum heat engine described by the full Dicke model. The system exhibit quantum phase transitions under certain conditions. We consider the system performing a Stirling thermodynamic cycle. We obtain an enhancement of efficiency when during the cycle the coupling parameter cross a critical value. We analyze the effect of unbalance between rotating and counter-rotating terms in the model. The maximum efficiency is obtained when the contributions of the counter-rotating and rotating terms are equal. The relation between ground state degeneracy, related to the quantum phase transition, and maximum efficiency is investigated.

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