# Faculty and Researchers

## Mathematics and Physics

An introduction to faculty staff members and laboratories in the Mathematics and Physics.

Note: Information on the laboratories is current as of the 2024 academic year. There may be changes to this information in the 2025 academic year.

#### ARITOMO Yoshihiro

- Position
- Professor
- Laboratory
- Laboratory of Nuclear Reaction Energy

##### Nuclear Engineering, Nuclear Reaction Theory, Synthesis of Super-Heavy Elements

Under the theme of utilizing energy from nuclear reactions, we have taken up the challenge of elucidating the dynamics of nuclear reactions. We are engaged in wide-ranging research on nuclear fusion and fission, transmutation, reprocessing, and synthesis of super-heavy elements.

#### IKEDA Toru

- Position
- Professor
- Laboratory
- Manifold Laboratory

##### Topology, 3D Manifolds, Knot Theory

A 3-manifold is a space in which a 3D coordinate system can be drawn around arbitrary points. Although it’s difficult to visualize an entire 3-manifold, work here involves cutting and pasting spaces and curves in order to study geometric properties such as symmetry.

#### ISHIBASHI Akihiro

- Position
- Professor
- Laboratory
- General Relativity and Cosmology Laboratory

##### General Relativity, Gravitation, Cosmology

Investigation is conducted into overall space dynamics and black holes using general relativity. A focus of research is on high-dimensional space models and high-dimensional black holes, which look at the possibilities of high-dimensional space-time.

#### INOUE TARO Kaiki

- Position
- Professor
- Laboratory
- Laboratory for Cosmology

##### Cosmology, Astrophysics, Galactic Astronomy

In Inoue Laboratory, we study various phenomena on cosmological scales using theoretical and observational methods, in order to elucidate unknown physical laws and mechanisms in the Universe. In particular, we focus on the bending of light paths due to general relativistic effects (gravitational lensing) and changes in light energy (gravitational redshift), and verify the consistency of cosmological models through synergy between theory and observations. In recent years, we have been focusing on observational studies with the ALMA and Subaru telescopes, including verification of dark matter models, galaxy evolution in extremely large-scale low-density regions, deep learning for detecting astronomical objects, and the effect of active galactic nuclei (AGN) on galaxy formation.

#### ODA Fumihito

- Position
- Professor
- Laboratory
- Group Theory Laboratory

##### Representation Theory of Finite Groups

Examination is carried out into finite groups and their representation using a category theory approach. Research is conducted into group actions on simplicial complexes, semi-ordered sets, and modules.

#### KASAMATSU Kenichi

- Position
- Professor
- Laboratory
- Laboratory of Theoretical Condensed Matter Physics

##### Theory of Condensed Matter Physics

A Bose gas of neutral atoms cooled down to near absolute zero temperature causes a phase transition called Bose-Einstein condensation, resulting in quantum condensates possessing strange properties, as exemplified by superfluidity. We investigate various phenomena exhibited by atomic Bose-Einstein condensates.

#### KATO Yukihiro

- Position
- Professor
- Laboratory
- Experimental Particle Physics Laboratory

##### Experimental Particle Physics

We know that matter is composed of things like quarks and other subatomic particles. But what are subatomic particles composed of? Using a large particle accelerator, research here tries to answer questions like this.

#### KONDO Yasushi

- Position
- Professor
- Laboratory
- Quantum Control Laboratory

##### Quantum Information, Condensed Matter Physics

Research is carried out with an interest in a wide range of control methods, in which quantum mechanics such as quantum information and quantum control play an important role. In particular, if quantum computers are realized, it will change the world. It is hoped that the elemental research conducted here will help make such computers a reality.

#### SAKUMA Kazuhiro

- Position
- Professor
- Laboratory
- Topology Laboratory

##### Topology

I am studying 4D manifolds and the higher dimensional manifolds by using singularity theory of differentiable maps. There appears singular points in general which degenerate for the differential of smooth maps, so we try to observe the method of eliminating singularities with higer coranks.

#### TAKEMOTO Yasuhiko

- Position
- Professor
- Laboratory
- Industrial Management Engineering

##### Industrial Management Engineering, Quality Management, Operational Research, Applied Statistics

Industrial Management is a activity of achieving efficiency, rationalization, and optimization in production systems. This laboratory researches and develops some methods of Industrial Management based on data science and ICT.

#### CHINEN Koji

- Position
- Professor
- Laboratory
- Applicable Algebra Laboratory

##### Analytic Number Theory, Coding Theory

Coding theory is about ways to properly relay information. It is a comprehensive theory that is the result of numerous mathematical developments. Research is conducted with a focus on algebra, including coding theory as a mathematical theory and related group theory, and ring theory. Research is also conducted into analytic number theory as it relates to ciphers.

#### DOTERA Tomonari

- Position
- Professor
- Laboratory
- Soft Matter Physics Laboratory

##### Quasicrystal Physics, Soft Matter Physics, Condensed Matter Physics

This laboratory is the world leader in soft quasicrystal research. This laboratory made the world’s first discovery of a polymeric quasicrystal, implying that even soft matter has an ordered structure with no repetitive units. Theoretical research on the origin of the formation of soft quasicrystals appeared in Nature. Recently Dr. Dotera found the bronze-mean quasicrystal. Also, he aims to develop the science of gyroid.

#### NAKANO Hitoshi

- Position
- Professor
- Laboratory
- Laser Engineering Laboratory

##### Laser Engineering

We are actively conducting research related to laser and electrical energy control, for example, development of new lasers, new functional materials by laser treatment, laser peening, and development of fast high-voltage switch using power semiconductors.

#### MATSUI Yutaka

- Position
- Professor
- Laboratory
- Microlocal Analysis Laboratory

##### Mathematics, Algebraic Analysis, Microlocal Analysis

The field of specialty here is algebraic analysis, which grew out of research into differential equations. Using combinatorics and microlocal analysis, research is conducted into reversion formulas of radon transforms of constructible functions, and the behavior of images.

#### YANO Yohko

- Position
- Professor
- Laboratory
- Biophysics Laboratory

##### Biophysics, Chemical Physics, Structural Chemistry

Protein comes in various complex structures in the body in order to perform its functions. On the other hand, it easily changes form and loses its functions. These structural changes are observed using the world’s brightest X-rays in order to understand the mechanisms behind the formation of protein structures.

#### YAMASHITA Tomoki

- Position
- Professor
- Laboratory
- Discrete Mathematics Laboratory

##### Graph Theory

Most discrete structures can be expressed in graph form. Graph theory represents a major research field of discrete mathematics. Here, research is conducted into extremal graph theory, which is the relationship between invariants and local substructures of the graph.

#### YOSHIDA Minoru

- Position
- Professor
- Laboratory
- Fiber Optics Laboratory

##### Optical Fibers, Fiber Lasers, Laser Engineering

This lab does research on the fundamentals and potential applications of light, revolving not only around optical communications, but also the development of new lasers that use optical fibers. We also promote development of new optical technologies and enjoy discovering previously unknown phenomena involving light.

#### WAKABAYASHI Tomonari

- Position
- Professor
- Laboratory
- Molecular Physics and Quantum Chemistry

##### Physical Chemistry and Chemistry of Nanostructures

Laser ablated polyenes and fullerenes are studied by molecular spectroscopy and quantum chemistry. With experimental and theoretical knowledges on stability and structures of carbon molecules, microscopic views of high-temperature molecular processes are discussed.

#### OHNISHI Kohei

- Position
- Associate Professor

##### Nano devices, Superconducting devices, nano-fabrication process

#### OMURA Yuji

- Position
- Associate Professor
- Laboratory
- Theoretical Particle Physics Laboratory

##### Theoretical Particle Physics

We study a lot of new physics possibilities motivated by mysteries in our universe and discuss which models are realistic to explain the latest experimental results. We explore for unknown physics beyond the Standard Model of elementary particle.

#### SUZUKI Takao

- Position
- Associate Professor
- Laboratory
- Special Functions Laboratory

##### Special functions and Integrable systems

My research field is the theory of special functions which are defined by differential or difference equations in complex domains. These special functions are related to various fields of pure mathematics and applied mathematics. Therefore they are very interesting research object.

#### TAKEMURA Yuichiro

- Position
- Associate Professor
- Laboratory
- Plasma Engineering Laboratory

##### Plasma Engineering

Plasma is variously employed in, for example, plasma TVs and welding, and it has become an absolutely essential industrial technology. We are making practical application of this plasma and conducting research to find uses for it in a variety of other fields.

#### TANAKA Senku

- Position
- Associate Professor
- Laboratory
- Organic Electronics Laboratory

##### Organic Electronics, Organic Solar Cells

Our goal is to produce an advanced electronic device using organic semiconductors. We focus on the development of organic solar cells and perovskite solar cells.

#### DANSHITA Ippei

- Position
- Associate Professor
- Laboratory
- Quantum Many-Body Physics Laboratory

##### Theory of condensed matter physics, Theory of atomic, molecular, and optical physics, Theory of quantum control

In condensed matter systems, such as electrons in solids and liquid helium, competitions and/or collaborations of quantum nature and interparticle interactions lead to various interesting phenomena, including superfluidity, superconductivity, quantum phase transitions, and many-body localization. We develop theoretical methods describing quantum many-body systems, aiming to discover novel quantum many-body effects.

#### In Dae JONG

- Position
- Associate Professor
- Laboratory
- Knot Theory Laboratory

##### Knot Theory

Research is conducted into knot theory and low-dimension topology (3D and 4D). To investigate knots mathematically, often the invariants of knots are used. Research takes an interest in the relation between the algebraic properties of invariants and the geometrical properties of knots.

#### NAKAMURA Yayoi

- Position
- Associate Professor
- Laboratory
- Computational Algebraic Analysis Laboratory

##### Analytic Number Theory、Computational Algebraic Analysis

By the usage of residues, multiple polylogarithms and multiple zeta values are studied.

#### NISHIYAMA Masayoshi

- Position
- Associate Professor
- Laboratory
- Laboratory for Dynamic Living Systems

##### Biophysics, Bioimaging

Biomolecules are nanometer-sized molecular machines working in living cells. Our research goal is to elucidate the operating principle how biological molecular machines work efficiently in collaboration with water molecules.

#### FUJII Mami

- Position
- Associate Professor

#### HOHARA Shinya

- Position
- Associate Professor

##### Radiation Measurement

#### MASUI Takahiko

- Position
- Associate Professor
- Laboratory
- Solid State Physics Laboratory

##### Condensed Matter Physics (experiments)

In the field of condensed matter physics, it’s possible to conduct research by creating one’s own specimens and measuring these. It is interesting in a completely different way than mega science. The goal here is to discover new physical phenomena and new matter, as well as solve long-debated mysteries of science.

#### MISUMI Tatsuhiro

- Position
- Associate Professor
- Laboratory
- Quantum Field Theory Lab.

##### Theoretical Physics, Quantum Field Theory, Elementary Particle Physics

The most elementary objects in nature, called "elementary particles", are described by the theory named as "quantum field theory". In quantum field theory, the existence of particles is itself uncertain and the particles can emerge from the vacuum and can disappear too. In our Lab., we investigate the ways of analyzing quantum field theory and apply them to realistic phenomena in order to obtain deeper understanding of the nature.

#### YOSHIDA Shuhei

- Position
- Associate Professor
- Laboratory
- Photonics Laboratory

##### Optical Engineering, Holography, Information Storage Engineering

We are addressing research and development on measurement, display, visualization, and information storage technologies based on holography.

#### TSUTSUMI Yasuhiro

- Position
- Lecturer

##### Optical fiber sensing, optical communication

We engage in research related to optical measurement technology and optical communication technology, such as optical fiber sensing, which uses optical fibers as sensors and also as communication paths for sensor signals, and optical fiber communication.

#### NOBUKAWA Kumiko

- Position
- Lecturer
- Laboratory
- High-energy Astrophysics Lab.

##### High-energy Astrophysics

X-ray observations have revealed that the universe is hot and energetic. My research focuses on high-energy phenomena occurring in our galaxy. I am also developing the CCD detector onboard the XRISM satellite.

#### KOMORI Daichi

- Position
- Assistant Professor