单层
激子
各向异性
材料科学
垂直的
极化(电化学)
超快激光光谱学
分子物理学
吸收(声学)
衰减系数
扩散
凝聚态物理
分析化学(期刊)
光学
化学
纳米技术
物理
热力学
物理化学
激光器
几何学
复合材料
色谱法
数学
作者
Qiannan Cui,Jiaqi He,Matthew Z. Bellus,Mirzojamshed Mirzokarimov,Tino Hofmann,Hsin-Ying Chiu,Matthew Antonik,Dawei He,Yongsheng Wang,Hui Zhao
出处
期刊:Small
[Wiley]
日期:2015-08-28
卷期号:11 (41): 5565-5571
被引量:93
标识
DOI:10.1002/smll.201501668
摘要
Anisotropic optical and transport properties of monolayer ReS2 fabricated by mechanical exfoliation are reported. Transient absorption measurements with different polarization configurations and sample orientations reveal that the absorption coefficient and transient absorption are both anisotropic, with maximal and minimal values occurring when the light polarization is parallel and perpendicular to the Re atomic chains, respectively. The maximal values are about a factor of 2.5 of the minimal values. By resolving the spatiotemporal dynamics of excitons, it is found that the diffusion coefficient of excitons moving along Re atomic chains is about 16 cm(2) s(-1) at room temperature, which is about a factor of three larger than those moving perpendicular to that direction. An exciton lifetime of 40 ps is also extracted. These findings establish monolayer ReS2 as an anisotropic 2D transition metal dichalcogenide.
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