Ground state cooling of magnomechanical resonator in $${\cal P}{\cal T}$$-symmetric cavity magnomechanical system at room temperature

• DOI: 10.1007/s11467-020-0996-y
• Publication Date: 2020-10-02T07:02:58Z
• Authors: Zhi-Xin Yang; Liang Wang; Yu-Mu Liu; Dong-Yang Wang; Cheng-Hua Bai; Shou Zhang; Hong-Fu Wang
• Keywords: 0103 physical sciences; 01 natural sciences

We propose to realize the ground state cooling of magnomechanical resonator in a parity-time ( $${\cal P}{\cal T}$$ )-symmetric cavity magnomechanical system composed of a loss ferromagnetic sphere and a gain microwave cavity. In the scheme, the magnomechanical resonator can be cooled close to its ground state via the magnomechanical interaction, and it is found that the cooling effect in $${\cal P}{\cal T}$$ -symmetric system is much higher than that in non- $${\cal P}{\cal T}$$ -symmetric system. Resorting to the magnetic force noise spectrum, we investigate the final mean phonon number with experimentally feasible parameters and find surprisingly that the ground state cooling of magnomechanical resonator can be directly achieved at room temperature. Furthermore, we also illustrate that the ground state cooling can be flexibly controlled via the external magnetic field.