Tsukazaki, A., Ohtomo, A., Kawasaki, M., Akasaka, S., Yuji, H., Tamura, K., ...
We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1-xO/ZnO single heterostructures (x = 0.05, 0.08,...
Shifting donor-acceptor photoluminescence in N-doped ZnO (2006)
Makino, Takayuki, Tsukazaki, A., Ohtomo, A., Kawasaki, M., Koinuma, H.
We have grown nitrogen-doped ZnO films grown by two kinds of epitaxial methods on lattice-matched ScAlMgO$_4$ substrates. We measured the photoluminescence (PL) of the two kinds of ZnO:N layers in...
Hole Transport in p-Type ZnO (2006)
Makino, Takayuki, Ohtomo, Akira, Tsukazaki, A., Kawasaki, M., Koinuma, H.
A two-band model involving the A- and B-valence bands was adopted to analyze the temperature dependent Hall effect measured on N-doped \textit{p}-type ZnO. The hole transport characteristics...
Majority-Carrier Mobilities in Undoped and \textit{n}-type Doped ZnO Epitaxial Layers (2005)
Makino, T., Segawa, Y., Tsukazaki, A., Ohtomo, A., Kawasaki, M.
Transparent and conductive ZnO:Ga thin films are prepared by laser molecular-beam epitaxy. Their electron properties were investigated by the temperature-dependent Hall-effect technique. The 300-K...
Spectral shape analysis of ultraviolet luminescence in \textit{n}-type ZnO:Ga (2005)
Makino, T., Segawa, Y., Yoshida, S., Tsukazaki, A., Ohtomo, A., Kawasaki, M., ...
Thin films of laser molecular-beam epitaxy grown \textit{n}-type Ga-doped ZnO were investigated with respect to their optical properties. Intense room-temperature photoluminescence (PL) in the...
Electron transport in ZnO thin films (2005)
Makino, T., Segawa, Y., Tsukazaki, A., Ohtomo, A., Kawasaki, M.
Epitaxial, n-type ZnO films grown by a laser molecular-beam epitaxy method were investigated by the temperature-dependent Hall-effect technique. The 300-K carrier concentration and mobility were...
Makino, T., Segawa, Y., Yoshida, S., Tsukazaki, A., Ohtomo, A., Kawasaki, M.
We investigated the optical properties of epitaxial \textit{n}-type ZnO films grown on lattice-matched ScAlMgO$_4$ substrates. As the Ga doping concentration increased up to $6 \times 10^{20}$...
Magneto-Optical Spectroscopy of Anatase TiO2 Doped with Co (2002)
Fukumura, T., Yamada, Y., Tamura, K., Nakajima, K., Aoyama, T., Tsukazaki, A., ...
Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field...