Enhancement of efficiency in the Dicke model quantum heat engine
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2019
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| _version_ | 1866910605781237760 |
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| author | Alcalde, M. Aparicio Arias, E. Svaiter, N. F. |
| author_facet | Alcalde, M. Aparicio Arias, E. Svaiter, N. F. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1906_00292 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Enhancement of efficiency in the Dicke model quantum heat engine Alcalde, M. Aparicio Arias, E. Svaiter, N. F. Quantum Physics Mesoscale and Nanoscale Physics 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. |
| title | Enhancement of efficiency in the Dicke model quantum heat engine |
| topic | Quantum Physics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1906.00292 |