Quantum Brayton cycle with coupled systems as working substance

Abstract

We explore the quantum version of Brayton cycle with a composite system as the working substance. The actual Brayton cycle consists of two adiabatic and two isobaric processes. Two pressures can be defined in our isobaric process, one corresponds to the external magnetic field (characterized by $F_x$) exerted on the system, while the other corresponds to the coupling constant between the subsystems (characterized by $F_y$). As a consequence, we can define two types of quantum Brayton cycle for the composite system. We find that the subsystem experiences a quantum Brayton cycle in one quantum Brayton cycle (characterized by $F_x$), whereas the subsystem's cycle is of quantum Otto in another Brayton cycle (characterized by $F_y$). The efficiency for the composite system equals to that for the subsystem in both cases, but the work done by the total system are usually larger than the sum of work done by the two subsystems. The other interesting finding is that for the cycle characterized by $F_y$, the subsystem can be a refrigerator while the total system is a heat engine. The result in the paper can be generalized to a quantum Brayton cycle with a general coupled system as the working substance.

7 pages, 3 figures, accepted by Phys. Rev. E

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• Quantum Otto engine with a spin $1/2$ coupled to an arbitrary spin
• Quantum Otto engine with exchange coupling in the presence of level degeneracy
• Coefficient of performance for a low-dissipation Carnot-like refrigerator with nonadiabatic dissipation
• Measurement-induced operation of two-ion quantum heat machines
• Lipkin-Meshkov-Glick Model in a Quantum Otto Cycle
• Efficiency at maximum power of a quantum Otto engine: Both within finite-time and irreversible thermodynamics
• Entangled quantum Otto heat engines based on two-spin systems with the Dzyaloshinski-Moriya interaction
• Quantum Otto cycle efficiency on coupled qudits
• Critical-point behavior of a measurement-based quantum heat engine
• Maximum Power Output of Quantum Heat Engine with Energy Bath
• Quantum optomechanical straight-twin engine
• Coefficient of performance under maximum $\chi$ criterion in a two-level atomic system as a refrigerator
• Non-Hermitian heat engine with all-quantum-adiabatic-process cycle
• Quantum heat engines with complex working media, complete Otto cycles and heuristics
• Quantum Stirling heat engine with squeezed thermal reservoir
• Multilevel quantum Otto heat engines with identical particles
• Anisotropy-assisted thermodynamic advantage of a local-spin thermal machine
• Impact of nonideal cycles on the efficiency of quantum heat engines
• Ancilla measurement-based Quantum Otto engine using double-pair spin architecture