课题组硕士生于娟在国际物理光学期刊Optics Express上发表论文

2020-04-14 14:28:13 500

祝贺课题组成员于娟在国际物理光学期刊Optics Express上发表论文

    近日,课题组成员于娟同学在刘老师的指导下,以第一作者在美国光学学会旗下著名光学期刊《Optics Express上发表题为“Observation of Double Indirect Interlayer Exciton in WSe2/WS2 Heterostructure(范德华异质结WSe2/WS2双间接激子的特性)”的实验论文。

图片关键词

图一:二维材料范德华异质结WSe2/WS2双间接激子的特性

    范德华层间激子(IX)由空间分离的电子-空穴对产生,这归因于范德华过渡金属二卤化碳(TMDCs)异质结构(HSS)中的鲁棒库仑相互作用。IX的特征是结合能更大,其寿命比直接激子的寿命长几个数量级,这为长寿命激子器件的制造和激子量子点的探索提供了重要的平台。但是,目前的研究仅限于单层激子,并且在WSe2/ WS2范德华异质结中同时捕获和研究双IX仍然具有挑战性。本论文中我们在低温下成功观察到了WSe2/ WS2 范德华异质结双间接IX的存在,其发射中心分别为1.4585eV(〜25.9meV宽)和1.4885eV(〜14.4meV宽)。有趣的是,双IXS发射峰的强度几乎相等,并且它们之间的能量差与WS2导带(CB)理论计算的分裂值非常吻合。此外,在8KPL光谱中成功观察到了材料中其他类型的激子发光。这种独特的双IX功能与激子识别相结合,为进一步研究TMDC的新物理特性和探索激子器件应用技术提供了新的机会。

文章链接:https://www.osapublishing.org/oe/abstract.cfm?uri=oe-28-9-13260.

Comments:

  • This is a very interesting and important observation in the field of materials science and optoelectronics. The discovery of double indirect interlayer excitons in WSe2/WS2 heterostructures opens up new possibilities for the development of high-performance optoelectronic devices. This observation provides insights into the nature of interlayer excitons and their potential for efficient light emission. Moreover, the study of double indirect interlayer excitons in these heterostructures can provide a foundation for the development of new types of optical devices, such as photodetectors and light-emitting diodes. The results of this observation are a significant step forward in the field of materials science and optoelectronics, and they have the potential to lead to major advancements in this field.