Tsutomu NOJIMA
Associate Professor, Institute for Materials Research, Tohoku University- Field of Specialty：
- Experiment of low temperature physics
- Topics of Research：
- (C01) Novel Phenomena in Electron Fluids with Broken Inversion Symmetry
- Specific Topics：
- Study of electric-field-induced surface superconductivity
■ Laboratory Website
RESEARCH
I have been studying various topics in superconducting phenomenology, such as anisotropic behavior of the critical field containing dimensional crossover, vortex matter physics, and superconductor-insulator transition, in multilayered and thin film superconductors as well as in high-Tc cuprates and MgB2. Spin dependent electronic transport in superconductor/ferromagnet hybrid and ferromagnetic nano-granular films and Fermiology in heavy electron compounds have been also my research interests. Very recently, I have been absorbed in the investigation of electric-field-induced superconductivity occurring at the surface of an insulator with an electric-double-layer FET structure, which leads to my subject in this research area.
The two-dimensional electron gas induced by electric field is a typical model system without spatial inversion symmetry, where the electronic properties are affected by the Rashba-type spin-orbit interaction. During this grant program, we experimentally examine the detailed properties of electric-field-induced superconductivity in SrTiO3 and KTaO3, which have similar crystal and band structures but differ in the strength of spin-orbit coupling, and compare the results of them. Through the studies, we intend to capture novel superconducting phenomena originating from the combined effect of broken inversion symmetry and spin-orbit coupling, which can be linked with new topological quantum phenomena.
EDUCATION
- 1986
- Bachelor of Science (Physics), Hiroshima University
- 1991
- Ph.D., Hiroshima University
PROFESSIONAL EXPERIENCE
- 1991-1999
- Research Associate, Faculty of Science, Chiba University
- (1997-1998
- Visiting Scientist, Kamerlingh Onnes Laborarory, LeidenUniversity, dispatched by Japan Society for the Promotion of Science)
- 1999-2006
- Associate Professor, Center for Low Temperature Science, Tohoku University
- 2006-Present
- Associate Professor, Institute for Materials Research, Tohoku University
HONORS AND AWARDS
- 2008
- Cryogenic Society of Japan, Award for excellent presentation
SELECTION OF PUBLICATIONS
"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).
"Electrical Resistivity in Ferromagnetic TM-Al-O (TM = Fe, Co) Granular Films: Scattering by Spin Waves and Kondo Like Behavior",
S. Nakamura, T. Nojima, A. Yshihara, S. Ohnuma, and H. Fujimori,
J. Phys. Soc. Jpn 78, 074708(1)-(6), (July 2009).
"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 Mat. 7, 855-858, (Nov 2008).
"Unusual Evolution of the Conduction-Electron State in CexLa1-xB6 from Non-Fermi Liquid to Fermi Liquid",
S. Nakamura, M. Endo, H. Yamamoto, T. Isshiki, N. Kimura, H. Aoki, T. Nojima, S. Otani, and S. Kunii,
Phys. Rev. Lett. 97, 237204(1)-(4), (December 2006).
"Disappearance of Bose-Glass Behavior in Transport Properties of YBa2Cu3Oy Films with Columnar Defects",
T. Nojima, M. Katakura, S. Okayasu, S. Endo, and N. Kobayashi,
J. Low. Temp. Phys. 131, 859-863, (June 2003).
"Current-induced vortex motion and the vortex-glass transition in YBa2Cu3Oy films",
T. Nojima, A. Kakinuma, and Y. Kuwasawa,
Phys. Rev. B. 56, R14291-R14294, (December 1997).
