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Periodically Driven Quantum Thermal Machines from Warming up to Limit Cycle.
- Source :
-
Physical Review Letters . 11/12/2021, Vol. 127 Issue 20, p1-1. 1p. - Publication Year :
- 2021
-
Abstract
- Theoretical treatments of periodically driven quantum thermal machines (PD-QTMs) are largely focused on the limit-cycle stage of operation characterized by a periodic state of the system. Yet, this regime is not immediately accessible for experimental verification. Here, we present a general thermodynamic framework that handles the performance of PD-QTMs both before and during the limit-cycle stage of operation. It is achieved by observing that periodicity may break down at the ensemble average level, even in the limit-cycle phase. With this observation, and using conventional thermodynamic expressions for work and heat, we find that a complete description of the first law of thermodynamics for PD-QTMs requires a new contribution, which vanishes only in the limit-cycle phase under rather weak system-bath couplings. Significantly, this contribution is substantial at strong couplings even at limit cycle, thus largely affecting the behavior of the thermodynamic efficiency. We demonstrate our framework by simulating a quantum Otto engine building upon a driven resonant level model. Our results provide new insights towards a complete description of PD-QTMs, from turn-on to the limit-cycle stage and, particularly, shed light on the development of quantum thermodynamics at strong coupling. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FIRST law of thermodynamics
*QUANTUM thermodynamics
*PHOTONS
*MACHINERY
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 127
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 153512799
- Full Text :
- https://doi.org/10.1103/PhysRevLett.127.200602