论文标题
天空如何显得庞大且无质量
How a skyrmion can appear both massive and massless
论文作者
论文摘要
当将磁性天空映射为点粒子时，其动力学取决于天空中心的精确定义。定义为天空密度的第一时刻的指导中心位置表现出Thiele的无质量动态。基于磁化成分$ m_z $的第一瞬间的位置显示了巨大粒子的Larmor振荡特征。我们表明，即使有后一个定义，某些类型的外力（例如绝热旋转扭矩）也可能没有Larmor振荡。我们提供了一个具有两个耦合无质量颗粒的天空源的机械模型。
When a magnetic skyrmion is modeled as a point particle, its dynamics depends on the precise definition of the skyrmion center. The guiding-center position, defined as the first moment of the skyrmion density, exhibits Thiele's massless dynamics; position based on the first moment of magnetization component $m_z$ shows Larmor oscillations characteristic of a massive particle. We show that, even with the latter definition, the Larmor oscillations may be absent for certain types of external forces such as adiabatic spin torque. We offer an alternative mechanical model of a skyrmion featuring two coupled massless particles.
