Jobu MATSUNO
Senior Research Scientist, RIKEN- Topics of Research：
- Development of novel topological insulators by superlattice band-structure engineering
■ Laboratory Website
■ Description of Research
[1075KB]
RESEARCH
I have developed novel thin-film compounds by utilizing epitaxial stabilization. Since epitaxial energy at interface is effective in case of thin films, we can stabilize thermodynamically unstable phases in single-crystalline form. For example, I have synthesized K2NiF4-type ferromagnet Sr2CoO4 and A-site deficient spinel Ir2O4.
In this project, I will focus on development of topological insulators in iridium oxide thin films. 5d electron systems are characterized by two competing energy scales, namely, spin-orbit coupling and electron correlation; we can expect correlated topological insulators in 5d systems such as Ir oxides. In the past two years, I fabricated superlattices [(SrIrO3)m, SrTiO3] of which dimensionality is controlled by changing m. I found that the sample with m = 1 has a Mott insulating ground state, which is eliminated by increasing m up to 4. Such control of the electronic phases can be achieved only by superlattice band-structure engineering. By making full use of the superlattice technique, I will realize [(SrIrO3)2, (SrTiO3)2] superlattice grown on (111) direction, which is theoretically predicted to be a topological insulator.
EDUCATION
- 1996
- B.S. in Physics, University of Tokyo, Department of Physics
- 2001
- Ph.D. in Physics, University of Tokyo, Department of Physics
PROFESSIONAL EXPERIENCE
- 2001
- Postdoctoral Researcher, Tokura Research Group, Joint Research Center for Atom Technology (JRCAT)
- 2002
- Postdoctoral Researcher, Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST)
- 2004
- Postdoctoral Researcher, Spin SuperStructure Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST)
- 2005
- Research Scientist, Magnetic Materials Laboratory, RIKEN
- 2008
- Senior Research Scientist, Magnetic Materials Laboratory, RIKEN
- 2013-Present
- Senior Research Scientist, Advanced Device Laboratory, RIKEN
- 2013-Present
- Senior Research Scientist, RIKEN Center for Emergent Matter Science (CEMS) (concurrently)
SELECTION OF PUBLICATIONS
"Momentum-resolved electronic excitations in the novel Mott insulator Sr2IrO4 studied by resonant inelastic x-ray scattering",
K. Ishii, I. Jarrige, M. Yoshida, K. Ikeuchi, J. Mizuki, K. Ohashi, T. Takayama,
J. Matsuno, and H. Takagi,
Physical Review B 83, 115121 (2011).
"Epitaxially stabilized iridium spinel oxide without cations in the tetrahedral site",
H. Kuriyama, J. Matsuno, S. Niitaka, M. Uchida, D. Hashizume, A. Nakao, K. Sugimoto, H. Ohsumi, M. Takata, and H. Takagi,
Applied Physics Letters 96, 182103 (2010).
"Magnetic field tuning of interface electronic properties in manganite-titanate junctions",
J. Matsuno, A. Sawa, M. Kawasaki, and Y. Tokura,
Applied Physics Letters 92, 122104 (2008).
"Variation of the electronic structure in systematically synthesized Sr2MO4 (M = Ti, V, Cr, Mn, and Co)",
J. Matsuno, Y. Okimoto, M. Kawasaki, and Y. Tokura,
Physical Review Letters 95, 176404 (2005).
"Metallic ferromagnet with square-lattice CoO2 sheets",
J. Matsuno, Y. Okimoto, Z. Fang, X. Z. Yu, Y. Matsui, N. Nagaosa, M. Kawasaki, and Y. Tokura,
Physical Review Letters 93, 167202 (2004).
"Synthesis and electronic structure of epitaxially stabilized Sr2-xLaxVO4 (0 <= x <= 1) thin films",
J. Matsuno, Y. Okimoto, M. Kawasaki, and Y. Tokura,
Applied Physics Letters 82, 194 (2003).
