Kazunori UENO
Associate Professor, Department of Basic Science, The University of Tokyo- Field of Specialty：
- Oxide thin films, electronic devices
- Topics of Research：
- (C01) Novel Phenomena in Electron Fluids with Broken Inversion Symmetry
- Specific Topics：
- Tranport properties of electric-field-induced superconductivity
■ Laboratory Website
RESEARCH
We have recently discovered an electric field-induced superconductivity in an insulator. Electric-field-induced metallic state in an insulator has been widely studied in semiconductor physics by using field-effect transistor (FET). We developed a new transistor device, electric double layer transistor, by employing a liquid electrolyte as a gate dielectric. As a result, the device can induce sufficient charge carrier density for superconductivity. We are now focusing both on development of a new superconducting material by field-induced carrier doping, and exploring physical properties of a two dimensional superconductivity.
We will study on superconducting properties of electric field induced superconductor in an insulator. Two-dimensional superconductivity has been studied on thin films of conventional superconductors. Electric field induced superconductivity is a new superconducting phenomena, where electrons can freely move towards two dimensional directions. Therefore, we expect new superconducting properties on these materials. In addition, we would like to study on difference of superconducting properties induced in SrTiO3 and KTaO3 surface, since KTaO3 has much stronger spin-orbit coupling interaction than that of SrTiO3.
EDUCATION
- 1999
- B. Sc. in Engineering, Department of Applied Chemistry, University of Tokyo
- 2004
- Ph. D in Science, Graduate School of Frontier Science, University of Tokyo
PROFESSIONAL EXPERIENCE
- 2004-2008
- Researcher, Institute for Materials Research, Tohoku University
- 2008-2011
- Assistant Professor, WPI Advanced Institute for Materials Research,
Tohoku University - 2011-Present
- Associate Professor, Department of Basic Science,
The University of Tokyo
SELECTION OF PUBLICATIONS
"Effective thickness of two-dimensional superconductivity in a tunable triangularquantum well of SrTiO3",
K. Ueno, T. Nojima, S. Yonezawa, M. Kawasaki, Y. Iwasa, Y. Maeno,
Physical Review B 89, 020508-1-5 (Jan. 2014).
"Discovery of superconductivity in KTaO3 byelectrostatic carrier doping",
K. Ueno, S. Nakamura, H. Shimotani, H. T. Yuan, N. Kimura, T. Nojima, H. Aoki, Y. Iwasa, M. Kawasaki,
Nature Nanotechnology 6, 408-412 (Jul. 2011).
"Electrically-induced ferromagnetism at room temperature in cobalt-doped titanium dioxide",
Y. Yamada, K. Ueno, T. Fukumura, H. T. Yuan, H. Shimotani, Y. Iwasa, L. Gu, S. Tsukimoto, Y. Ikuhara, M. Kawasaki,
Science 332, 1065-1067 (May. 2011).
"Electric-field-induced superconductivity in an insulator",
K. Ueno, S. Nakamura, H. Shimotani, A. Ohtomo, N. Kimura, T. Nojima, H. Aoki, Y. Iwasa, and M. Kawasaki,
Nature Materials 7, 855 (2008).
"Anomalous Hall effect in anatase Ti1-xCoxO2-δ at low temperature regime",
K. Ueno, T. Fukumura, H. Toyosaki, M. Nakano and M. Kawasaki,
Applied Physics Letters, 90, 072103 (2007).
"Field-effect transistor on SrTiO3 with sputtered Al2O3 gate insulator ",
K. Ueno, I. H. Inoue, H. Akoh, M. Kawasaki, Y. Tokura and H. Takagi,
Applied Physics Letters, 83, 1755 (2003).
