论文标题
谐振旋转轨道扭矩系统中的水平吸引力和特殊点
Level attraction and exceptional points in a resonant spin-orbit torque system
论文作者
论文摘要
水平吸引力可以出现在驱动的系统中，在驱动的系统中，而不是排斥两种模式在一个由两个特殊点隔开的区域中合并。该行为是针对光学机械和光磁系统的，最近观察到了耗散型镁 - 两极。我们证明了这种机制存在于自旋轨道扭矩系统中，在该系统中，磁性振荡器与电子储层共互联。通过应用电场可以提供模式吸引力所需的不稳定机制。该场激发了旋转轨道分裂带之间的带间跃迁，从而导致磁振荡器的不稳定性。然后，两个特殊点出现在振荡器能量谱和不稳定性区域中。我们讨论了可能发生这种情况的条件，并估计与RashBA偶联的自旋轨道扭矩振荡器到达吸引区域所需的电场强度。使用磁化率测量进行实验检测的建议。
Level attraction can appear in driven systems where instead of repulsion two modes coalesce in a region separated by two exceptional points. This behavior was proposed for optomechanical and optomagnonic systems, and recently observed for dissipative cavity magnon-polaritons. We demonstrate that such a regime exists in a spin-orbit torque system where a magnetic oscillator is resonantly coupled to an electron reservoir. An instability mechanism necessary for mode attraction can be provided by applying an electric field. The field excites interband transitions between spin-orbit split bands leading to an instability of the magnetic oscillator. Two exceptional points then appear in the oscillator energy spectrum and the region of instability. We discuss conditions under which this can occur and estimate the electric field strength necessary for reaching the attraction region for a spin-orbit torque oscillator with Rashba coupling. A proposal for experimental detection is made using magnetic susceptibility measurements.
