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702 labs · 51 student voices

Akira Sakai, Professor
0 student voices
The Mathematical Sciences group pursues research in applied mathematics and mathematical sciences that connect with the other sciences. Like Boolean algebra and Turing's computing machine, mathematics has changed the workings of society while asking what thinking is. Building on partial differential equations, ergodic theory, nonlinear dynamical systems, and probability theory, each faculty member and graduate student pursues a theme of their own. Another feature is the wide range of styles, from theoretical research to research that uses computers to help analyze phenomena.

Tatsuo Kobayashi, Professor
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The Particle Physics and Cosmology Lab theoretically studies the smallest units that make up matter, the fundamental forces acting between them, and the nature of time and space. These questions are not independent but intricately intertwined. Unraveling such fundamental mysteries of nature is the aim of particle theory. The research ranges from work that seeks to understand phenomena observed in accelerator experiments to work that explores, through theoretical consistency, the ultra-high-energy world beyond the reach of experiments. It is a lab suited to those who want to pursue to the end the simple question of what the most fundamental principles and theories are.

Takashi Okamoto, Professor
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The Theoretical Astrophysics Lab studies how structures at many levels of the universe, from stars and black holes to galaxies and galaxy clusters, were born and evolved. For each era from just after the Big Bang to the present, the lab uses numerical simulations and semi-analytic models based on them. Its calculations run on supercomputers such as RIKEN's Fugaku and the National Astronomical Observatory of Japan's Aterui II, and incorporate radiation, magnetic fields, and chemical reactions in addition to fluid dynamics and gravity. The simulation results are compared with observational studies, which helps to clarify the evolution of the real universe from the theoretical side.

Satoru Hayami, Professor
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The Statistical Physics Lab studies properties of electrons in solids, such as magnetism and dielectric properties, using theory and numerical computation. In strongly correlated electron systems, where electrons repel each other strongly, not only charge but also spin and orbital degrees of freedom become entangled, giving rise to properties not found in ordinary metals. The lab also uses first-principles calculations and machine learning to understand real materials and to search for new materials with novel functions. The Okuda group also studies phase transitions in spin glasses, coupled oscillators, and complex networks.

Shoji Yamamoto, Professor
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The Mathematical Physics Lab theoretically studies new cooperative quantum phenomena that emerge in low-dimensional materials, where the motion of particles is restricted. Its targets include phenomena in which the charge and spin of electrons behave separately, and quantum tunneling of magnetization in small molecular magnets. The lab takes two approaches: analytical calculations such as spin-wave theory, and large-scale numerical calculations such as quantum Monte Carlo methods. Recently, topology and two-dimensional quasicrystals have also become key topics, and the lab is advancing research in collaboration with experimental groups.

Hiroshi Amitsuka, Professor
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The J-Material Strongly Correlated Electron Physics Lab experimentally studies properties of electrons in solids, such as superconductivity and magnetism. The lab develops new functions brought about by spin-orbit interaction and the breaking of crystal symmetry, as well as materials that have these functions, which it calls “J-Materials.” It measures thermal, magnetic, electrical, and ultrasonic properties at extremely low temperatures, in high magnetic fields, and under ultrahigh pressure, and combines these with microscopic experiments such as neutron scattering and X-ray measurements. The lab also conducts research on order and fluctuations using X-ray diffraction and laser spectroscopy, and on phenomena that appear in light-excited states.

Hiroyuki Yoshida, Professor
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The Solid State Electronic Properties Lab creates new materials, examines their properties precisely, and searches for new quantum phenomena. As with the discovery of copper-oxide high-temperature superconductors, the development of new materials has played a major role in the advance of condensed matter physics. Through the search for original new materials and the evaluation of their physical properties with advanced measurements, the lab aims to experimentally verify quantum phases predicted by theory.

Atsushi Kawamoto, Professor
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The Low-Dimensional Materials Physics Lab experimentally studies new quantum phenomena that appear in materials where electron motion is confined to one or two dimensions. Using NMR (nuclear magnetic resonance) as its main method, the lab investigates various ordered states in molecular conductors and strongly correlated electron systems. Using electrical and magnetization measurements at low temperatures, high magnetic fields, and high pressures, as well as low-temperature scanning tunneling microscopy, the lab studies superconductivity and charge and spin density waves. The lab also studies topological quantum phenomena in small samples made by microfabrication, and can synthesize the organic compounds used in its research within the lab.

Kazuo Sorai, Professor
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The Observational Astronomy Lab studies, through radio observations, where and how stars form within galaxies. It investigates the distribution, mass, motion, and properties of the cold interstellar gas that forms the raw material for stars, using imaging observations of radio spectra and the resulting data. The lab also studies galaxy morphology using archival data from infrared satellites, and builds radio observing instruments.

Kaya Kobayashi, Professor
0 student voices
The Quantum Condensed Matter Physics Lab works both on creating new materials and on discovering properties that are not yet known. In experiments, the lab develops quantum materials that show superconductivity or magnetism. It makes samples by high-pressure synthesis and vacuum deposition, examines them with diffraction experiments and electron microscopy, and measures how electricity flows through them and their magnetization. In theory, the lab uses field theory to calculate how electrons flow in spintronic devices and topological insulators. The lab is located in the Research Institute for Electronic Science, and students from the Department of Physics carry out their graduation research here.
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