| 单层WSe2、MoSe2激子发光的压力诱导K-Λ交互转变 |
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| 引用本文： | 付鑫鹏,周强,秦莉,李芳菲,付喜宏.单层WSe2、MoSe2激子发光的压力诱导K-Λ交互转变[J].发光学报,2018,39(12):1647-1653. |
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| 作者姓名： | 付鑫鹏 周强 秦莉 李芳菲 付喜宏 |
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| 作者单位： | 1. 中国科学院长春光学精密机械与物理研究所 发光学及应用国家重点实验室, 吉林 长春 130033;
2. 吉林大学 物理学院, 吉林 长春 130012 |
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| 基金项目： | 国家重点研发计划（2018YFB1107600）；吉林省科技发展计划项目（20160204073GX）资助 |
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| 摘 要： | 采用机械剥离法在金刚石对顶砧中制备了单层WSe2和MoSe2样品，利用高压微区荧光光谱测量技术，在氩传压介质环境下对其激子发光行为进行了高压调控研究。其中单层WSe2的中性和负电激子演化趋势在2.43 GPa处出现拐点，单层MoSe2中性激子发光在3.7 GPa处发生了劈裂。结合第一性原理计算分析，确认该不连续现象的产生机制为压力诱导的导带底K-Λ交互转变。该结果可以扩大至整个二维层状材料体系，为发展激子器件垫定基础。
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| 关 键 词： | 单层WSe2 单层MoSe2 金刚石对顶砧 激子 |
| 收稿时间： | 2018-08-12 |
Pressure-induced K-Λ Crossover of Excitons Emissions in Monolayer WSe2 and MoSe2 |
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| FU Xin-peng,ZHOU Qiang,QIN Li,LI Fang-fei,FU Xi-hong.Pressure-induced K-Λ Crossover of Excitons Emissions in Monolayer WSe2 and MoSe2[J].Chinese Journal of Luminescence,2018,39(12):1647-1653. |
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| Authors: | FU Xin-peng ZHOU Qiang QIN Li LI Fang-fei FU Xi-hong |
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| Institution: | 1. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;
2. College of Physics, Jilin University, Changchun 130012, China |
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| Abstract: | Monolayer MoSe2 and WSe2 samples were prepared by mechanical exfoliation in diamond anvil cell(DAC). The high-pressure micro-area fluorescence spectroscopy technique was used to study excitons emission behavior under pressure in argon pressure-transmitting medium(PTM). The neutral and negative exciton evolutionary trends of monolayer WSe2 showed an inflection point at 2.43 GPa, and the neutral exciton emission of monolayer MoSe2 appeared a new split peak at 3.7 GPa. Combined with the first-principles calculation and analysis, we confirmed that the mechanism of these discontinuities is the pressure-induced conduction band bottom K-Λ crossover. This result can be extended to the entire two-dimensional layered material family, and laying foundation for the development of exciton devices. |
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| Keywords: | monolayer WSe2 monolayer MoSe2 diamond anvil cell excitons |
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