Magnon squeezing enhanced ground-state cooling in cavity magnomechanics

M. Asjad, Jie Li, Shi Yao Zhu, J. Q. You

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Cavity magnomechanics has recently become a new platform for studying macroscopic quantum phenomena. The magnetostriction induced vibration mode of a large-size ferromagnet or ferrimagnet reaching its ground state represents a genuine macroscopic quantum state. Here we study the ground-state cooling of the mechanical vibration mode in a cavity magnomechanical system, and focus on the role of magnon squeezing in improving the cooling efficiency. The magnon squeezing is obtained by exploiting the magnon self-Kerr nonlinearity. We find that the magnon squeezing can significantly and even completely suppress the magnomechanical Stokes scattering. It thus becomes particularly useful in realizing ground-state cooling in the unresolved-sideband regime, where the conventional sideband cooling protocols become inefficient. We also find that the coupling to the microwave cavity plays only an adverse effect in mechanical cooling. This makes essentially the two-mode magnomechanical system (without involving the microwave cavity) a preferred system for cooling the mechanical motion, in which the magnon mode is established by a uniform bias magnetic field and a microwave drive field.

Original languageBritish English
Pages (from-to)3-7
Number of pages5
JournalFundamental Research
Volume3
Issue number1
DOIs
StatePublished - Jan 2023

Keywords

  • Cavity magnomechanics
  • Dispersive coupling
  • Ground-state cooling
  • Magnetostriction
  • Optomechanics

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