论文标题
山谷极化波动，双重性和二维半导体的切换
Valley polarization fluctuations, bistability, and switching in two-dimensional semiconductors
论文作者
论文摘要
我们研究了原子 - 薄半导体中激子的理论上非线性谷地极化动力学。由于激发子激子相互作用引起的有效磁场，显着极化的存在减慢了山谷的松弛。我们解决了山谷极化激子的时间动力学，并研究了极化激素气体的稳态。我们证明了山谷极化的双重性，其中形成了两个具有低谷和高山谷极化的稳态。我们研究了这种系统中波动和噪声的影响。我们评估了山谷极化的自相关函数，并证明对于高极化状态，波动的特征是高振幅和较长的松弛时间。我们研究由系统中的噪声引起的低谷和高谷极化状态之间的切换，并证明具有高山谷极化状态在广泛的抽水速率中优先。
We study theoretically nonlinear valley polarization dynamics of excitons in atom-thin semiconductors. The presence of significant polarization slows down valley relaxation due to an effective magnetic field resulting from exciton-exciton interactions. We address temporal dynamics of valley polarized excitons and study the steady states of the polarized exciton gas. We demonstrate bistability of the valley polarization where two steady states with low and high valley polarization are formed. We study the effects of fluctuations and noise in such system. We evaluate valley polarization autocorrelation functions and demonstrate that for a high-polarization regime the fluctuations are characterized by high amplitude and long relaxation time. We study the switching between the low- and high-valley polarized states caused by the noise in the system and demonstrate that the state with high valley polarization is preferential in a wide range of pumping rates.
