期刊
PHYSICAL REVIEW B
卷 104, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L241406
关键词
-
资金
- Deutsche Forschungsgemeinschaft [CRC 1083]
- Emmy Noether Initiative [CH 1672/1, 287022282, CRC 1277, 314695032, CRC 953]
- European Unions Horizon 2020 research and innovation program [881603]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter ct.qmat [EXC 2147, 390858490]
- 2D-TECH competence center
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP19H05790, JP20H00354]
This study demonstrates the key role of dark intervalley states in monolayer WSe2 in governing the exciton-exciton annihilation process, and reveals a characteristic temperature dependency of Auger scattering in this class of materials with excellent agreement between theory and experiment. The research provides microscopic insights into the efficiency of technologically relevant Auger scattering channels within atomically thin semiconductors' remarkable exciton landscape.
The exceptionally strong Coulomb interaction in semiconducting transition-metal dichalcogenides (TMDs) gives rise to a rich exciton landscape consisting of bright and dark exciton states. At elevated densities, excitons can interact through exciton-exciton annihilation (EEA), an Auger-like recombination process limiting the efficiency of optoelectronic applications. Although EEA is a well-known and particularly important process in atomically thin semiconductors determining exciton lifetimes and affecting transport at elevated densities, its microscopic origin has remained elusive. In this joint theory-experiment study combining microscopic and material-specific theory with time- and temperature-resolved photoluminescence measurements, we demonstrate the key role of dark intervalley states that are found to dominate the EEA rate in monolayer WSe2. We reveal an intriguing, characteristic temperature dependence of Auger scattering in this class of materials with an excellent agreement between theory and experiment. Our study provides microscopic insights into the efficiency of technologically relevant Auger scattering channels within the remarkable exciton landscape of atomically thin semiconductors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据