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제목 [3/21] [colloquium] Confined excitons in Monolayer TMDs
작성자 물리학과홈피 등록일 2017-03-16 오후 2:19:44 조회수 112
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날짜 : 3월 21일
 
시간 : 오후 4시 30분
 
장소 : R404
 
연사 : 김정용 교수님(성균관대 에너지과학과)
 
제목 : Confined excitons in Monolayer TMDs
 
내용: 
Transition-metal dichalcogenide (TMD) monolayers are atomically thin two-dimensional (2D) semiconductors with the direct bandgap providing ideal platforms to study the interaction between light and confined excitons. Due to the 2D nature and strong Coulomb interaction resulting in large binding energies, these TMD monolayers host various exciton complexes of not only neutral excitons also charged excitons (trions) and biexcitons, routinely observable in room temperature. Using nanoscale optical imaging and spectroscopy, we will show that these exciton complexes coexist competing for the light emission, which largely depend on the surface conditions such as local defects or excess charge populations and the enhanced optical properties can be engineered by heterostructures of TMD monolayers.  
Another advantageous aspect of TMD monolayers are their flat lateral nature and the efficient light emission which make the coupling of surface plasmons using metallic nanostructures highly efficient, suitable for nanophotonics applications. We will discuss that surface plasmons can be generated, propagated and detected by using simple configuration of overlaying Ag nanowires on monolayer MoS2. This hybrid system displayed the high coupling efficiency of 32% and a resonant interaction of neutral excitons and surface plasmons.
 
 



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