Magnon-driven quantum dot refrigerators

• A three-terminal quantum dot refrigerator is proposed.
• The effects of magnetic field, applied voltage, and polarization are considered.
• The region that the system can work as a refrigerator is determined.
• Two different magnon-driven quantum dot refrigerators are compared.

A new model of refrigerator consisting of a spin-splitting quantum dot coupled with two ferromagnetic reservoirs and a ferromagnetic insulator is proposed. The rate equation is used to calculate the occupation probabilities of the quantum dot. The expressions of the electron and magnon currents are obtained. The region that the system can work in as a refrigerator is determined. The cooling power and coefficient of performance (COP) of the refrigerator are derived. The influences of the magnetic field, applied voltage, and polarization of two leads on the performance are discussed. The performances of two different magnon-driven quantum dot refrigerators are compared.