Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe(2).
Nonlinear dynamics of trions under strong optical excitation in monolayer MoSe(2).
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单层 MoSe2 强光激发下三重子的非线性动力学
DOI：
10.1038/s41598-018-20810-6
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发表时间：
2018-02-05
影响因子：
4.6
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Ye J;Yan T;Niu B;Li Y;Zhang X
通过采用基于双色泵浦探针光谱的超快瞬态反射测量，在近共振激发下，研究了单层MoSe2中三重子在相对高的激发密度下的布居和谷偏振动力学。人们发现，三重子共振的非线性动态光漂白和激子共振的红移是多体相互作用导致的激发能量和密度依赖的瞬态反射变化的原因。此外，从偏振分辨测量结果表明，在强光激发下观察到的trion的初始快速布居和偏振衰减过程是由trion形成、瞬态相空间填充和激子的短谷寿命决定的。这些结果提供了对三重子布居和谷去极化的非线性动力学以及原子薄MoSe2和其他过渡金属二硫属化物材料中激子-三重子相关性的基本理解。
By employing ultrafast transient reflection measurements based on two-color pump-probe spectroscopy, the population and valley polarization dynamics of trions in monolayer MoSe2were investigated at relatively high excitation densities under near-resonant excitation. Both the nonlinear dynamic photobleaching of the trion resonance and the redshift of the exciton resonance were found to be responsible for the excitation-energy- and density-dependent transient reflection change as a result of many-body interactions. Furthermore, from the polarization-resolved measurements, it was revealed that the initial fast population and polarization decay process upon strong photoexcitation observed for trions was determined by trion formation, transient phase-space filling and the short valley lifetime of excitons. The results provide a basic understanding of the nonlinear dynamics of population and valley depolarization of trions, as well as exciton-trion correlation in atomically thin MoSe2and other transition metal dichalcogenide materials.
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影响因子：
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作者：
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通讯作者：
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