Observation of Rapid Exciton鈥揈xciton Annihilation in Monolayer Molybdenum Disulfide

详细信息    查看全文

• 作者：Dezheng Sun ; Yi Rao ; Georg A. Reider ; Gugang Chen ; Yumeng You ; Louis Br茅zin ; Avetik R. Harutyunyan ; Tony F. Heinz
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5625-5629
• 全文大小：249K
• ISSN：1530-6992

文摘

Monolayer MoS₂ is a direct-gap two-dimensional semiconductor that exhibits strong electron鈥揾ole interactions, leading to the formation of stable excitons and trions. Here we report the existence of efficient exciton鈥揺xciton annihilation, a four-body interaction, in this material. Exciton鈥揺xciton annihilation was identified experimentally in ultrafast transient absorption measurements through the emergence of a decay channel varying quadratically with exciton density. The rate of exciton鈥揺xciton annihilation was determined to be (4.3 卤 1.1) 脳 10^鈥? cm²/s at room temperature.

Keywords:

MoS₂; transient absorption spectroscopy; exciton dynamics; exciton鈭抏xciton annihilation