arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.05795cond-mat.mes-hallcond-mat.str-el
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激子极化激元的光电流

Photocurrent of exciton polaritons

Takahiro Morimoto, Naoto Nagaosa

摘要:

研究了反转破缺系统中激子极化激元的光电流。利用有效哈密顿量和格林函数方法推导了极化激元光电流公式。得到的公式表明,极化激元光电流与极化激元密度成正比,且上下分支的极化激元光电流符号相反。非零极化激元光电流除了需要反转对称破缺外,还需要时间反转对称破缺。我们发现,激子状态的过渡金属dichalcogenides,如MoS $_2$支持极化激元光电流,一旦我们打破时间反演对称性,通过施加磁场或使用光子与圆偏振。我们还进行了基于速率方程的模拟,并研究了脉冲激发后极化激元光电流的时间分布,这表明光电流提供了一个有用的非线性探针来研究激子极化激元的非平衡动力学。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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