Enhancement of efficiency in the Dicke model quantum heat engine

Autor:	Alcalde, M. Aparicio, Arias, E., Svaiter, N. F.
Rok vydání:	2019
Předmět:	Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
Popis:	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. Comment: 16 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1906.00292 Zobrazit plný text záznamu View this record from Arxiv