NEW MATERIALS SCIENCE
YOSHIHIKO OKAMOTO LAB.
INTRODUCTION OF LABORATORY
To improve the performance of today’s electron devices dramatically, it is essential to incorporate new device materials with higher functionality. In the electron device operations, the carrier density change in semiconductors occurs in the near-interface region within several or tens of nanometers of the interface between the semiconductor and the insulating layer. Therefore, in order to fully utilize new device materials, it is essential to control the atomic arrangement and physical properties in this nano-region near the interface, by designing appropriate fabrication processes based on the deep understanding of the properties of those materials. For example, it is contributing to an energy-saving society to signicantly improve the efciency of power devices for electric power conversion, by fully utilizing wide-gap semiconductors instead of Si as the new device material. The materials showing superior dielectric properties such as ferroelectricity in nanometer-thick lms, are expected to be applied to new non-volatile memory technology that will support the next-generation computing.
ワイドギャップ半導体SiCのMOSFET反転層移動度のアニール処理による向上効果
ワイドギャップ半導体SiCとゲート絶縁膜SiO2の界面と、赤外分光による構造解析
CaAgPにおいて実現した、「ノーダルライン半金属」と呼ばれる珍しい電子構造。Pdを添加したCaAgP単結晶の電気抵抗は、磁場中で特異な振る舞いを示した。
MESSAGE
WHAT IS THE MOST MEANINGFUL STUDY TO DEVELOP THE TECHNOLOGIES FOR THE FUTURE SOCIETY? THAT WAS THE REASON WHY I STARTED TO LEARN MATERIALS SCIENCE. IN THE WORLD OF ELECTRON DEVICES, “THINGS WE HOPE TO DO” ARE CHANGING TO “THINGS WE CAN DO” EVERY DAY.
I majored in chemical engineering because learning chemis-try seemed necessary to understand the technology for the benet of our society, such as the technologies for environ-mental conservation and efcient usage of energy. After graduation, I started to work with a professor leading the cutting-edge research on electron devices with in-depth knowledge of physics. While I kept struggling to pursue his many creative ideas, I nally found my way to come to where I am today. Today materials science provides one of the keys for develop-ing advanced electron devices. In this research eld, special-ists in materials science are not the majority, so I always feel I am responsible for the role to clarify the technological issues in device physics from a perspective of materials science. In those researches, we cannot nd a solution without repeat-ing trials to test our various ideas over and over again. That is how future technology develops. We should enjoy such struggling to keep moving the technology forward.
keyword
Dirac electron system / thermoelectric conversion / geometric frustration / superconductivity / Dirac electron / magnetic field-induced strain / thermoelectric conversion materials / 5d electron system / 5d transition metal compounds / antiferromagnets / new material development / frustration / copper minerals / Kagome lattice / Volume function / Chromium compounds / Magnetostriction / Energy conversion / One-dimensional electronic systems / Thermoelectric cooling / New materials development / Low-dimensional electronic systems / Topological semimetals / Topological superconductivity / Nodal ring semimetals / Topological physical properties / Phases Transition / Spatial inversion symmetry / Line nodes / Reverse perovskite / Calcium compounds / Ca compounds / Solid refrigeration materials / Negative thermal expansion / Solid refrigeration / Pyrochlore lattice / Heat and energy conversion materials / Heat and energy conversion / Pyrochlore / Energy conversion materials / Pyrochlore structure / Spin-orbit interaction / Ir compounds / New materials / Strongly correlated electron systems / Iridium compounds / Spin-orbit coupling / New superconductors / Search for new materials / Geometrically frustrated magnetic materials / Quantum spin / Spin liquids
PROFILE : Professor Yoshihiko Okamoto
2001-2006 Department of Advanced Materials Science, University of Tokyo, Dr. Sci.
2006 Special Postdoctoral Researcher, RIKEN
2006-2014 Research Associate, Institute for Solid State Physics, University of Tokyo
2014-2022 Associate Professor, Department of Applied Physics, Nagoya University
2014-2018 Associate Professor, Institute for Advanced Research, Nagoya University
2018-2019 Visiting Associate Professor, Institute for Chemical Research, Kyoto University
2018-2022 Specially Appointed Associate Professor, Institute of Innovative Research, Tokyo Institute of Technology
2022 Professor, Institute for Solid State Physics, University of Tokyo
SOLID STATE PHYSICS AND CHEMISTRY
The feeling of “interesting!” turns the impossible into possible and contributes to its practical application.
Yoshihiko Okamoto Lab.,
Department Of Advanced Materials Science,
Graduate School of Frontier Sciences,
The University of Tokyo
Kashiwanoha 5-1-5,
Kashiwa,Chiba 277-8561, Japan
+81-4-7136-3250
yokamoto@issp.u-tokyo.ac.jp
The Goal of Applied Physics
The goal of Applied Physics is to develop a stage = “new material” that can manipulate undeveloped degrees of freedom, to explore unknown phenomena created from that stage and to bring out excellent functions, and to bring out its excellent functions. The purpose is to contribute to the development of human society by elucidating the mechanisms and developing application fields for these phenomena and functions.
AMS (Advanced Materials Science)
Department Office
AMS (Advanced Materials Science),
Graduate School of Frontier Sciences,
The University of Tokyo
Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8561, Japan
Email : ams-office(at)ams.k.u-tokyo.ac.jp
Please change (at) to @.