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arXiv 2409.17752cond-mat.mes-hallcond-mat.mtrl-sciphysics.optics
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石墨烯/MoS2异质结构中由超快电荷转移诱导的瞬态Trion观测

Observation of Transient Trion Induced by Ultrafast Charge Transfer in Graphene/MoS2 Heterostructure

Chen Wang, Yu Chen, Qiushi Ma, Peng Suo, Kaiwen Sun, Yifan Cheng, Xian Lin, Weimin Liu, Guohong Ma

AI总结:

本研究提出通过超快电荷转移在Gr/MoS2异质结构中产生瞬态trion并控制其与激子比率,揭示了其动力学特性,为二维准粒子构建与多体相互作用控制提供新视角。

摘要:

由TMDCs构成的范德华(Vdw)异质结构为探索各种准粒子行为提供了理想平台,其中由中性激子和带电载流子组成的trion是一个典型例子。通常有三种方法产生trion:电学掺杂、化学掺杂和直接光学掺杂。前两种方法产生静态trion,而最后一种产生瞬态trion。在此,我们提出了一种间接光学掺杂方法,通过超快电荷转移(CT)产生瞬态trion,并在Gr/MoS2异质结构中通过调节CT实现了对trion与激子比率的控制。此外,我们证明了用该方法产生的瞬态trion的动力学特性,其寿命略长于激子,这归因于trion与带电缺陷之间的库仑相互作用。本研究为二维结构中新准粒子的构建、动力学表征及多体相互作用的控制提供了新视角。

英文摘要:

Van der Waals (Vdw) heterostructures constructed from TMDCs provide an ideal platform for exploring various quasiparticle behaviors, with trion-composed of neutral exciton and charged carrier-being a notable example. There are typically three methods to generate trion: electrical doping, chemical doping, and direct optical doping. The first two methods generate static trion, while the last gives rise to transient trion. Here, we present an indirect optical doping approach to generate transient trion via ultrafast charge transfer (CT) and achieve control over the trion-to-exciton ratio by adjusting CT in Gr/MoS2 heterostructure. Furthermore, we demonstrated that dynamics of the transient trion generated with this method, which shows slightly longer lifetime than that of exciton accounted for the Coulomb interactions between trion and charged defect. This study provides fresh perspectives on the construction of new quasiparticles, dynamical characterization and the control of the many-body interaction in two-dimensional structure.

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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