论文标题
激子极化子的光电流
Photocurrent of exciton polaritons
论文作者
论文摘要
我们研究反转破坏系统中激子极化子的光电流。我们使用有效的哈密顿和格林的功能方法来推断北极星光电流的公式。所获得的公式显示偏振光电流与极化的密度成正比，并显示上下分支的相反符号。除反转对称性破坏外，非散热北极星光电流还需要时间逆转对称性。我们表明，一旦我们通过应用磁场或使用具有圆极化的光子，我们打破了时间逆转对称性后，过渡金属二分法中的激子状态（例如MOS $ _2 $）支持Polariton Photocurrent。我们还基于速率方程进行了仿真，并研究了脉冲激发后极性光电流的时间曲线，这表明光电流提供了一种有用的非线性探针来研究激发层的非平衡动力学。
We study photocurrent of exciton polaritons in inversion broken systems. We use an effective Hamiltonian and Green's function approaches to deduce the formula for polariton photocurrent. The obtained formula shows the polariton photocurrent is proportional to the polariton density and shows opposite signs for the upper and lower branches. Nonvanishing polariton photocurrent requires time reversal symmetry breaking in addition to inversion symmetry breaking. We show that exciton states in transition metal dichalcogenides such as MoS$_2$ support polariton photocurrent once we break time reversal symmetry by applying magnetic fields or using photons with circular polarization. We also perform a simulation based on a rate equation and study a time profile of polariton photocurrent after pulse excitation, which indicates that the photocurrent provides a useful nonlinear probe to study nonequilibrium dynamics of exciton polaritons.
