Search Results - "Ohtomo, A."

A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface by Ohtomo, A, Hwang, H Y

“…Polarity discontinuities at the interfaces between different crystalline materials (heterointerfaces) can lead to nontrivial local atomic and electronic…”
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Electric-field-induced superconductivity in an insulator by Ueno, K, Kawasaki, M, Nakamura, S, Shimotani, H, Ohtomo, A, Kimura, N, Nojima, T, Aoki, H, Iwasa, Y

“…Electric field control of charge carrier density has long been a key technology to tune the physical properties of condensed matter, exploring the modern…”
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Observation of the fractional quantum Hall effect in an oxide by Tsukazaki, A, Kawasaki, M, Akasaka, S, Nakahara, K, Ohno, Y, Ohno, H, Maryenko, D, Ohtomo, A

“…The quantum Hall effect arises from the cyclotron motion of charge carriers in two-dimensional systems. However, the ground states related to the integer and…”
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Quantum Hall Effect in Polar Oxide Heterostructures by Tsukazaki, A, Ohtomo, A, Kita, T, Ohno, Y, Ohno, H, Kawasaki, M

“…We observed Shubnikov-de Haas oscillation and the quantum Hall effect in a high-mobility two-dimensional electron gas in polar ZnO/MgxZn₁₋xO heterostructures…”
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Superconductivity in Ti4O7 and γ-Ti3O5 films by Yoshimatsu, K., Sakata, O., Ohtomo, A.

“…Titanium dioxide is one of the most popular compounds among simple oxides. Except for the fully oxidized titanate, titanium oxides have partially filled d…”
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Electronic Structures and Photoanodic Properties of Ilmenite-type MTiO3 Epitaxial Films (M = Mn, Fe, Co, Ni) by Yoshimatsu, K, Mashiko, H, Umezawa, N, Horiba, K, Kumigashira, H, Ohtomo, A

“…We performed systematic study on electronic structures and photoelectrochemical (PEC) properties of ilmenite-type MTiO3 (M = Mn, Fe, Co, and Ni) thin-film…”
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Nitrogen doped MgxZn1−xO/ZnO single heterostructure ultraviolet light-emitting diodes on ZnO substrates by Nakahara, K., Akasaka, S., Yuji, H., Tamura, K., Fujii, T., Nishimoto, Y., Takamizu, D., Sasaki, A., Tanabe, T., Takasu, H., Amaike, H., Onuma, T., Chichibu, S. F., Tsukazaki, A., Ohtomo, A., Kawasaki, M.

“…We have grown nitrogen-doped MgxZn1−xO:N films on Zn-polar ZnO single crystal substrates by molecular beam epitaxy. As N-sources, we employed NO-plasma or NH3…”
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Optical properties of LiNbO2 thin films by Kurachi, T., Yamaguchi, T., Kobayashi, E., Soma, T., Ohtomo, A., Makino, T.

“…The complex dielectric functions of LiNbO2 were determined using optical transmittance and reflectance spectroscopies at room temperature. The measured…”
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Band gap engineering based on MgxZn1−xO and CdyZn1−yO ternary alloy films by Makino, T., Segawa, Y., Kawasaki, M., Ohtomo, A., Shiroki, R., Tamura, K., Yasuda, T., Koinuma, H.

“…We describe the structural and optical properties of II–VI oxide alloys, MgxZn1−xO and CdyZn1−yO, grown by pulsed-laser deposition. Single-phase alloyed films…”
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Large anisotropy in conductivity of Ti2O3 films by Yoshimatsu, K., Kurokawa, H., Horiba, K., Kumigashira, H., Ohtomo, A.

“…We investigated electronic properties of Ti2O3 films with film thickness of ∼150 nm. The temperature dependence of resistivity indicated characteristic phase…”
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Artificial charge-modulation in atomic-scale perovskite titanate superlattices by Ohtomo, A, Muller, D A, Grazul, J L, Hwang, H Y

“…The nature and length scales of charge screening in complex oxides are fundamental to a wide range of systems, spanning ceramic voltage-dependent resistors…”
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Reversible superconductor-insulator transition in LiTi2O4 induced by Li-ion electrochemical reaction by Yoshimatsu, K., Niwa, M., Mashiko, H., Oshima, T., Ohtomo, A.

“…Transition metal oxides display various electronic and magnetic phases such as high-temperature superconductivity. Controlling such exotic properties by…”
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Fabrication and Characterization of Semiconductor Photoelectrodes with Orientation-Controlled α‑Fe2O3 Thin Films by Mashiko, H, Yoshimatsu, K, Oshima, T, Ohtomo, A

“…Epitaxial α-Fe2O3 thin films on conducting Ta-doped SnO2 bottom layers are prepared by pulsed-laser deposition in order to elucidate variation of the…”
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Structure and optical properties of ZnO/Mg0.2Zn0.8O superlattices by Ohtomo, A., Kawasaki, M., Ohkubo, I., Koinuma, H., Yasuda, T., Segawa, Y.

“…ZnO/Mg 0.2 Zn 0.8 O superlattices with a band-gap offset of about 0.5 eV were epitaxially grown by laser molecular-beam epitaxy on a sapphire(0001) substrate…”
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An oxide-diluted magnetic semiconductor: Mn-doped ZnO by Fukumura, T., Jin, Zhengwu, Ohtomo, A., Koinuma, H., Kawasaki, M.

“…Epitaxial thin films of an oxide-diluted magnetic semiconductor, Mn-doped ZnO, were fabricated by pulsed-laser deposition technique. Solubility of Mn into ZnO…”
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Surface depletion in doped SrTiO3 thin films by Ohtomo, A., Hwang, H. Y.

“…Strong effects of surface depletion have been observed in metallic La-doped SrTiO3 thin films grown on SrTiO3 substrates by pulsed-laser deposition. The…”
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Gallium concentration dependence of room-temperature near-band-edge luminescence in n -type ZnO : Ga by Makino, T., Segawa, Y., Yoshida, S., Tsukazaki, A., Ohtomo, A., Kawasaki, M.

“…We investigated the optical properties of epitaxial n -type ZnO films grown on lattice-matched ScAlMgO 4 substrates. As the Ga doping concentration increased…”
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Room-temperature ultraviolet laser emission from self-assembled ZnO microcrystallite thin films by Tang, Z. K., Wong, G. K. L., Yu, P., Kawasaki, M., Ohtomo, A., Koinuma, H., Segawa, Y.

“…Room-temperature ultraviolet (UV) laser emission of ZnO microcrystallite thin films is reported. The hexagonal ZnO microcrystallites are grown by laser…”
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High-mobility electronic transport in ZnO thin films by Tsukazaki, A., Ohtomo, A., Kawasaki, M.

“…A systematic study of electronic transport properties was carried out for ZnO thin films grown on high-temperature annealed buffer layers of semi-insulating Mg…”
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Electron transport in ZnO thin films by 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…”
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