论文标题
非线性自旋电流
Nonlinear Spin Currents
论文作者
论文摘要
Bai等人报道了两个铁氧体样品之间的腔介导的自旋电流。 al。 [物理。莱特牧师。 118，217201（2017）]。该实验是在存在外部驱动器的情况下在相互作用的线性状态下完成的。在目前的论文中，我们为非线性域中的旋转电流开发了一种理论，其中外部驱动器很强，因此需要包括铁氧体材料的Kerr非线性。通过这种方式，创建了非线性极性子，并且可以达到自旋电流的双态和多稳态行为。该系统被驱动到远离均衡稳态的远处，该稳态由驾驶场和各种相互作用的细节决定。我们为自旋电流提供了各种稳态结果。开发了非线性自旋电流的光谱检测，揭示了非线性极化子的关键特性。弱探针的传输用于获取有关自旋电流多稳态行为的定量信息。我们提出的结果和方法非常通用，可以在许多其他情况下使用腔体将信息从一个系统传输到另一个系统，例如两个不同的分子系统。
The cavity mediated spin current between two ferrite samples has been reported by Bai et. al. [Phys. Rev. Lett. 118, 217201 (2017)]. This experiment was done in the linear regime of the interaction in the presence of external drive. In the current paper we develop a theory for the spin current in the nonlinear domain where the external drive is strong so that one needs to include the Kerr nonlinearity of the ferrite materials. In this manner the nonlinear polaritons are created and one can reach both bistable and multistable behavior of the spin current. The system is driven into a far from equilibrium steady state which is determined by the details of driving field and various interactions. We present a variety of steady state results for the spin current. A spectroscopic detection of the nonlinear spin current is developed, revealing the key properties of the nonlinear polaritons. The transmission of a weak probe is used to obtain quantitative information on the multistable behavior of the spin current. The results and methods that we present are quite generic and can be used in many other contexts where cavities are used to transfer information from one system to another, e.g., two different molecular systems.
