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Title: Three-Dimensional Resonant Exciton in Monolayer Tungsten Diselenide Actuated by Spin-Orbit Coupling
Authors: CHI SIN TANG 
Yang, Ming
Wu, Di
Birowosuto, Muhammad Danang
Wu, Jing
Hettiarachchi, Chathuranga
Chin, Xin Yu
Chang, Yung-Huang
Ouyang, Fangping
Dang, Cuong
Pennycook,Stephen John 
Wang, Shijie
Chi, Dongzhi
Breese, Mark B H 
Zhang, Wenjing
Andrivo Rusydi 
Issue Date: 24-Dec-2019
Publisher: American Chemical Society
Citation: CHI SIN TANG, YIN XINMAO, Yang, Ming, Wu, Di, Birowosuto, Muhammad Danang, Wu, Jing, LI CHANGJIAN, Hettiarachchi, Chathuranga, Chin, Xin Yu, Chang, Yung-Huang, Ouyang, Fangping, Dang, Cuong, Pennycook,Stephen John, FENG YUAN PING, Wang, Shijie, Chi, Dongzhi, Breese, Mark B H, Zhang, Wenjing, Andrivo Rusydi, WEE THYE SHEN,ANDREW (2019-12-24). Three-Dimensional Resonant Exciton in Monolayer Tungsten Diselenide Actuated by Spin-Orbit Coupling. ACS Nano 13 (12) : 14529-14539. ScholarBank@NUS Repository.
Abstract: The intricate features of many-body interactions and spin-orbit coupling play a significant role in numerous physical phenomena. Particularly in two-dimensional transition metal dichalcogenides (2D-TMDs), excitonic dynamics are a key phenomenon that promises opportunities for diverse range of device applications. Here, we report the direct observation of a visible-range three-dimensional resonant exciton and its associated charged exciton in monolayer tungsten diselenide, as compared to monolayer molybdenum disulfide. A comprehensive experimental study that includes high-resolution TEM, Raman, high-resolution spectroscopic ellipsometry over a wide temperature range down to 4 K, high-energy temperature, and excitation power-dependent photoluminescence spectroscopy has been conducted. It is supported by first-principles calculations to unravel the influence of spin-orbit coupling in the formation of the resonant exciton and to identify its in-plane and out-of-plane features. Furthermore, we study the impact of temperature and thickness on the spin-orbit coupling strength in 2D-TMDs. This work is crucial in creating a platform in the fundamental understanding of high-energy resonant exciton in layered two-dimensional systems and that such high-energy optoelectronic features make them an increasingly attractive candidate for novel electronic and optoelectronic applications particularly in the aspects of solar cells and light-emitting diodes via the manipulation of excitonic states.
Source Title: ACS Nano
ISSN: 1936-0851
DOI: 10.1021/acsnano.9b08385
Appears in Collections:Staff Publications

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