Interlayer Exciton Transport in MoSe2/WSe2 Heterostructures,ACS Nano

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Interlayer Exciton Transport in MoSe2/WSe2 Heterostructures
ACS Nano ( IF 15.8 ) Pub Date : 2021-01-08 , DOI: 10.1021/acsnano.0c08981
Zidong Li , Xiaobo Lu , Darwin F. Cordovilla Leon , Zhengyang Lyu , Hongchao Xie , Jize Hou , Yanzhao Lu , Xiaoyu Guo , Austin Kaczmarek , Takashi Taniguchi ₁ , Kenji Watanabe ₂ , Liuyan Zhao , Li Yang , Parag B. Deotare

Affiliation

A moiré superlattice formed by stacking two lattice mismatched transition metal dichalcogenide monolayers, functions as a diffusion barrier that affects the energy transport and dynamics of interlayer excitons (electron and hole spatially concentrated in different monolayers). In this work, we experimentally quantify the diffusion barrier experienced by interlayer excitons in hexagonal boron nitride-encapsulated molybdenum diselenide/tungsten diselenide (MoSe₂/WSe₂) heterostructures with different twist angles. We observe the localization of interlayer excitons at low temperature and the temperature-activated diffusivity as a function of twist angle and hence attribute it to the deep periodic potentials arising from the moiré superlattice. We further support the observations with theoretical calculations, Monte Carlo simulations, and a three-level model that represents the exciton dynamics at various temperatures.

中文翻译：

MoSe ₂ / WSe ₂异质结构中的层间激子传输

通过堆叠两个晶格失配的过渡金属二卤化硅单层而形成的莫尔超晶格，起扩散势垒的作用，影响层间激子的能量传输和动力学（电子和空穴在空间上集中在不同的单层中）。在这项工作中，我们实验性地量化了层间激子在六角形氮化硼包裹的二硒化钼/二硒化钨（MoSe ₂ / WSe ₂）具有不同扭曲角的异质结构。我们观察到低温下层间激子的定位以及温度激活的扩散率与扭曲角的关系，因此将其归因于莫尔超晶格产生的深层周期性电势。我们用理论计算，蒙特卡洛模拟和代表不同温度下激子动力学的三级模型进一步支持了观测。

更新日期：2021-01-26

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