113學年材料所-第六週 專題研討課程 演講公告 (114年3月27日)
2025.03.21
演講題目:
Dark Excitons in 2D Materials
演講者: 陳劭宇博士(Dr. Shao-Yu Chen)
現職: 國立台灣大學 凝態科學研究中心 助理研究員
時間: 114年03月27日(四) 下午15:20~17:10
地點: 成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
內容摘要:
The tightly bound excitons in two-dimensional (2D) materials have garnered considerable interest for their remarkable optical, spintronic, and valleytronic properties. Although brightly luminescent excitons, which couple directly with light, have been thoroughly investigated for their effective light-matter interactions, dark excitons are less explored. Nonetheless, dark excitons display distinctive physical properties such as prolonged population lifetimes and extended diffusion lengths, which are vital for the manipulation of exciton dynamics in practical devices. Understanding and controlling both bright and dark excitons is essential for examining many-body Coulomb interactions and advancing exciton-based technologies with innovative functionalities.
In my talk, I will explore the many-body interactions of dark excitons in 2D transition metal dichalcogenides through optical spectroscopy. Our studies have identified dark-exciton-mediated biexcitons and exciton-trions in high-quality monolayer WSe2 devices, revealing substantial interactions between bright and dark excitons and emphasizing the critical role of dark excitons in these systems. Furthermore, we have observed that dark excitons can also facilitate efficient light upconversion through exciton-exciton annihilation. This discovery opens new avenues for manipulating dark excitons and potentially enhances their application in nanophotonic 2D-material-based photovoltaic and photocatalytic technologies.
歡迎各位撥冗參加!!
Dark Excitons in 2D Materials
演講者: 陳劭宇博士(Dr. Shao-Yu Chen)
現職: 國立台灣大學 凝態科學研究中心 助理研究員
時間: 114年03月27日(四) 下午15:20~17:10
地點: 成功大學成功校區三系館 鋼構區(3F)共同教室A1302演講廳
內容摘要:
The tightly bound excitons in two-dimensional (2D) materials have garnered considerable interest for their remarkable optical, spintronic, and valleytronic properties. Although brightly luminescent excitons, which couple directly with light, have been thoroughly investigated for their effective light-matter interactions, dark excitons are less explored. Nonetheless, dark excitons display distinctive physical properties such as prolonged population lifetimes and extended diffusion lengths, which are vital for the manipulation of exciton dynamics in practical devices. Understanding and controlling both bright and dark excitons is essential for examining many-body Coulomb interactions and advancing exciton-based technologies with innovative functionalities.
In my talk, I will explore the many-body interactions of dark excitons in 2D transition metal dichalcogenides through optical spectroscopy. Our studies have identified dark-exciton-mediated biexcitons and exciton-trions in high-quality monolayer WSe2 devices, revealing substantial interactions between bright and dark excitons and emphasizing the critical role of dark excitons in these systems. Furthermore, we have observed that dark excitons can also facilitate efficient light upconversion through exciton-exciton annihilation. This discovery opens new avenues for manipulating dark excitons and potentially enhances their application in nanophotonic 2D-material-based photovoltaic and photocatalytic technologies.
歡迎各位撥冗參加!!