T
Takafumi Yao
Researcher at Tohoku University
Publications - 591
Citations - 14672
Takafumi Yao is an academic researcher from Tohoku University. The author has contributed to research in topics: Molecular beam epitaxy & Photoluminescence. The author has an hindex of 49, co-authored 591 publications receiving 14287 citations. Previous affiliations of Takafumi Yao include National Institute of Advanced Industrial Science and Technology.
Papers
More filters
Journal ArticleDOI
Optically pumped lasing of ZnO at room temperature
TL;DR: In this paper, the authors reported the observation of optically pumped lasing in ZnO at room temperature using a plasma-enhanced molecular beam epitaxy on sapphire substrates.
Journal ArticleDOI
Plasma assisted molecular beam epitaxy of ZnO on c -plane sapphire: Growth and characterization
TL;DR: In this paper, a two dimensional nucleation during the initial growth was observed by in situ reflection high energy electron diffraction, followed by a morphology transition to 3D nucleation by using molecular beam epitaxy.
Journal ArticleDOI
High temperature excitonic stimulated emission from ZnO epitaxial layers
TL;DR: In this paper, the emission spectrum of high quality ZnO epilayers is studied from room temperature up to 550 K. At room temperature and low excitation power, a single emission peak is observed which may be identified with the free exciton from its peak energy and dependence on temperature.
Journal ArticleDOI
ZnO as a novel photonic material for the UV region
TL;DR: In this article, the feasibility of ZnO as photonic material for the UV region was addressed and it was concluded that ZnOs can be used for exciton-based photonic device applications owing to the high exciton binding energy.
Journal ArticleDOI
Layer-by-layer growth of ZnO epilayer on Al2O3(0001) by using a MgO buffer layer
TL;DR: By introducing a thin MgO buffer, layer-by-layer growth of ZnO epilayers on Al2O3(0001) substrates is achieved by plasma-assisted molecular beam epitaxy as mentioned in this paper.