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157 labs · 25 student voices
Faculties at Hokkaido University ›
Yuzuru Sato, Associate Professor
1 student voices
Prof. Sato studies nonlinear dynamical systems and complex systems, especially the complexity of spatiotemporal chaos. From the standpoint of random dynamical systems, the lab investigates what happens when deterministic chaos and stochastic noise are mixed. Main themes also include the phenomenology and time series analysis of dynamical systems with many degrees of freedom, and information-theoretic and computational analysis of chaotic dynamics. Building on dynamical systems theory and nonlinear physics, the lab extends its applications to neighboring fields such as computation theory, information theory, and predictive control.
Sohei Tasaki, Associate Professor
1 student voices
Prof. Tasaki studies, from a mathematical standpoint, how the complex structures of living systems arise and how they achieve their sophisticated functions. The lab looks across multiple levels: gene-level regulation that determines cell states, the movement of cell populations, the shapes of tissues, and the relationship with the surrounding environment. For each level, and for the links between levels, the lab builds mathematical models fitted to experimental data. The lab also develops new data analysis methods to extract the necessary information from high-dimensional life science data.
Yushi Nakano, Associate Professor
1 student voices
Prof. Nakano studies dynamical systems theory and ergodic theory. Dynamical systems theory is a field that examines how a system behaves after a long time has passed, given the law of its evolution over one unit of time. The objects of study are not limited to mechanical models, but also include mathematical models of natural and social phenomena such as population, stock prices, and rainfall. The property by which a small change in the initial state later has a large effect is called chaos, and the lab studies the statistical properties of such systems.
Toshiyuki Akita, Professor
0 student voices
The Geometry Lab approaches geometry as the study of measuring the shape of things. It extracts quantities that capture the features of a shape, and investigates whether those quantities truly describe the shape well and how they can be computed. Beyond triangles and surfaces, it treats physical phenomena, complex figures, solution sets of equations, groups, and information as “things that have shape.” Its research is broad, spanning topology, algebraic geometry, differential geometry, singularity theory, and mathematical physics, and members collaborate while preserving diversity.
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
0 student voices
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
0 student voices
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
0 student voices
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
0 student voices
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
0 student voices
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.
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