Abstract
Using phonons to simulate an optical two-level laser action has been the focus of research. We theoretically study phonon laser in a cavity magnomechanical system, which consist of a microwave cavity, a sphere of magnetic material and a uniform external bias magnetic field. This system can realize the phonon-magnon coupling and the cavity photon-magnon coupling via magnetostrictive interaction and magnetic dipole interaction respectively, the magnons are driven directly by a strong microwave field simultaneously. Frist, the intensity of driving magnetic field which can reach the threshold condition of phonon laser is given. Then, we demonstrate that the adjustable external magnetic field can be used as a good control method to the phonon laser. Compared with phonon laser in optomechanical systems, our scheme brings a new degree of freedom of manipulation. Finally, with the experimentally feasible parameters, threshold power in our scheme is close to the case of optomechanical systems. Our study may inspire the field of magnetically controlled phonon lasers.
Highlights
Using phonons to simulate an optical two-level laser action has been the focus of research
We study a cavity magnomechanical system, where a yttrium iron garnet (YIG) sphere is placed in a microwave cavity, there is an uniform external bias magnetic field H in the vertical direction simultaneously
An uniform external bias magnetic field H is introduced in the vertical direction, which establish the magnon-photon coupling[27,30], and the rate of coupling can be tuned by the position of the sphere
Summary
Using phonons to simulate an optical two-level laser action has been the focus of research. We theoretically study phonon laser in a cavity magnomechanical system, which consist of a microwave cavity, a sphere of magnetic material and a uniform external bias magnetic field. The intensity of driving magnetic field which can reach the threshold condition of phonon laser is given. We demonstrate that the adjustable external magnetic field can be used as a good control method to the phonon laser. The cavity magnomechanical systems has been becoming a novel platform for realizing the coupling between photons, magnons and phonons. The coupling between photons and magnons is realized by the magnetic dipole interaction, and magnetostrictive force is a key to the magnon-phonon coupling. It is worth noting that unlike optical pump in the traditional cavity optomechanical system, we introduce a magnetic drive field to to realize phonon laser.
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