Dissipative-enhanced quantum heat engine in an open cavity magnomechanical system

Abstract

We propose a magnetically controlled scheme to implement a quantum heat engine in an open cavity magnomechanical system, wherein the magnon mode can be directly manipulated by a biased magnetic field. This manipulation allows the switching of the two polariton branches between magnonlike and phononlike properties, establishing crucial connections with both the magnon and phonon reservoirs. The switch results in a quantum Otto cycle that can operate along the high-energy polariton branch, leading to the conversion of thermal energy into mechanical work in the coherent coupling mechanism while the negative work persists in the near-resonance domain. Owing to the dissipative coupling mechanism, negative work can be converted to positive work. Meanwhile, the work performed by the low-energy polariton branch is enhanced, and the efficiency is significantly improved. Our scheme provides new perspectives and methods for developing quantum heat engines in magnetic equipment, and the findings of this research hold significant potential applications for designing and preparing novel quantum heat engines in on-chip integrated magnetic devices.