Akira Chikamatsu
University of Tokyo
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Featured researches published by Akira Chikamatsu.
Applied Physics Express | 2008
Taro Hitosugi; Hideyuki Kamisaka; Koichi Yamashita; Hiroyuki Nogawa; Yutaka Furubayashi; Shoichiro Nakao; Naoomi Yamada; Akira Chikamatsu; H. Kumigashira; Masaharu Oshima; Yasushi Hirose; Toshihiro Shimada; Tetsuya Hasegawa
We have investigated electronic band structure of a transparent conducting oxide, Nb-doped anatase TiO2 (TNO), by means of first-principles band calculations and photoemission measurements. The band calculations revealed that Nb 4d orbitals are strongly hybridized with Ti 3d ones to form a d-nature conduction band, without impurity states in the in-gap region, resulting in high carrier density exceeding 1021 cm-3 and excellent optical transparency in the visible region. Furthermore, we confirmed that the results of valence band and core-level photoemission measurements are consistent with prediction by the present band calculations.
Physical Review B | 2005
K. Horiba; Akira Chikamatsu; Hiroshi Kumigashira; M. Oshima; N. Nakagawa; Mikk Lippmaa; Kanta Ono; M. Kawasaki; Hideomi Koinuma
We have investigated change in the electronic structures of atomically controlled
Applied Physics Letters | 2004
Hiroshi Kumigashira; Dai Kobayashi; R. Hashimoto; Akira Chikamatsu; M. Oshima; N. Nakagawa; Tsuyoshi Ohnishi; Mikk Lippmaa; H. Wadati; A. Fujimori; Kanta Ono; M. Kawasaki; Hideomi Koinuma
{\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}
Physical Review B | 2006
K. Ebata; H. Wadati; M. Takizawa; A. Fujimori; Akira Chikamatsu; Hiroshi Kumigashira; M. Oshima; Y. Tomioka; Y. Tokura
(LSMO) thin films as a function of hole-doping levels
Applied Physics Letters | 2006
Hiroshi Kumigashira; Akira Chikamatsu; R. Hashimoto; M. Oshima; Tsuyoshi Ohnishi; Mikk Lippmaa; H. Wadati; A. Fujimori; Kanta Ono; M. Kawasaki; Hideomi Koinuma
(x)
Journal of Applied Physics | 2010
Utahito Takeuchi; Akira Chikamatsu; Taro Hitosugi; Hiroshi Kumigashira; Masaharu Oshima; Yasushi Hirose; Toshihiro Shimada; Tetsuya Hasegawa
in terms of in vacuo photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS) measurements. The in vacuo PES measurements on a well-ordered surface of high-quality epitaxial LSMO thin films enable us to reveal their intrinsic electronic structures, especially the structure near the Fermi level
Physical Review B | 2005
M. Takizawa; D. Toyota; H. Wadati; Akira Chikamatsu; Hiroshi Kumigashira; A. Fujimori; M. Oshima; Zhong Fang; Mikk Lippmaa; M. Kawasaki; Hideomi Koinuma
({E}_{F})
Applied Physics Letters | 2014
Xi Shen; Akira Chikamatsu; Kei Shigematsu; Yasushi Hirose; Tomoteru Fukumura; Tetsuya Hasegawa
. We found that overall the features of the valence band as well as the core levels monotonically shifted toward lower binding energy as
Physical Review B | 2006
Akira Chikamatsu; H. Wadati; Hiroshi Kumigashira; M. Oshima; A. Fujimori; Noriaki Hamada; Tsuyoshi Ohnishi; Mikk Lippmaa; K. Ono; M. Kawasaki; Hideomi Koinuma
x
Physical Review B | 2005
H. Wadati; M. Takizawa; T. T. Tran; K. Tanaka; T. Mizokawa; A. Fujimori; Akira Chikamatsu; Hiroshi Kumigashira; Masaharu Oshima; Shintaro Ishiwata; Masaki Azuma; M. Takano
was increased, indicating the systematic chemical-potential shift of LSMO thin films with hole doping. The peak nearest to