激子
范德瓦尔斯力
异质结
光致发光
材料科学
超快激光光谱学
飞秒
电荷(物理)
凝聚态物理
简并能级
原子物理学
分子物理学
化学
光谱学
物理
光电子学
光学
量子力学
有机化学
分子
激光器
作者
Frank Ceballos,Matthew Z. Bellus,Hsin-Ying Chiu,Hui Zhao
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2015-01-01
卷期号:7 (41): 17523-17528
被引量:84
摘要
We show that the van der Waals heterostructure formed by MoSe2 and WS2 provides a unique system with near degenerate interlayer and intralayer excitonic states. Photoluminescence measurements indicate that the charge transfer exciton states are approximately 50 meV below the MoSe2 exciton states, with a significant spectral overlap. The transient absorption of a femtosecond pulse was used to study the dynamics of the charge transfer excitons at room temperature. We found a lifetime of approximately 80 ps for the charge transfer excitons. A diffusion coefficient of about 14 cm(2) s(-1) was deduced, which is comparable to individual excitons in transition metal dichalcogenides.
科研通智能强力驱动
Strongly Powered by AbleSci AI