Topological Quantum Phenomena in Condensed Matter with Broken Symmetries

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Jobu MATSUNO

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.

Jobu MATSUNO RESEARCH image

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).

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