磁振子衰变对参量泵浦磁振子的影响
Effect of magnon decays on parametrically pumped magnons
摘要：
研究了磁振子衰变对磁绝缘体钇铁石榴石（YIG）中参激磁振子非平衡动力学的影响。我们的研究是由Noack等人最近的一项实验激发的。[Phys. Status Solidi B 256，1900121（2019）]在磁场强度附近观察到YIG中自旋泵浦效应的增强，在该磁场强度下，磁振子通过磁振子的汇合而衰变在运动学上成为可能。为了解释实验结果，我们推导并求解了非平衡磁振子分布的动力学方程。磁振子衰变的影响是考虑微观通过碰撞积分来自相互作用顶点涉及三个权力的磁振子运营商。我们的结果与实验数据定量一致。
英文摘要：
We investigate the influence of magnon decays on the non-equilibrium dynamics of parametrically excited magnons in the magnetic insulator yttrium-iron garnet (YIG). Our investigations are motivated by a recent experiment by Noack et al. [Phys. Status Solidi B 256, 1900121 (2019)] where an enhancement of the spin pumping effect in YIG was observed near the magnetic field strength where magnon decays via confluence of magnons becomes kinematically possible. To explain the experimental findings, we have derived and solved kinetic equations for the non-equilibrium magnon distribution. The effect of magnon decays is taken into account microscopically via collision integrals derived from interaction vertices involving three powers of magnon operators. Our results agree quantitatively with the experimental data.
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