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Sekizawa Lab
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The lab uses theory and computation to unravel the quantum world, from atomic nuclei to neutron stars.
AboutAbout the lab
Savoring the appeal of quantum mechanics through theory and numerical computation.
The Sekizawa Lab studies quantum many-body systems, which are assemblies of many particles that obey quantum mechanics.
Its subjects include not only the structure and reactions of atomic nuclei, but also the interiors of neutron stars and the superfluidity that appears in cooled atomic gases.
The lab solves complex equations that cannot be solved by hand using computers, and searches for new phenomena that no one had imagined.
The lab actively recruits international students as well as students from Japan.
Key terms
- Quantum many-body system
- A system in which many particles gather and behave according to the laws of quantum mechanics, such as atomic nuclei and atomic gases
- Neutron star
- A very dense star made mostly of neutrons, left behind after a massive star explodes at the end of its life
- Superfluidity
- A state in which flow continues without friction. It appears at extremely low temperatures, and in fermionic systems it arises when particles form pairs
NewsLab news
Associate Professor Sekizawa received the School of Science Teaching Award
A doctoral student received the Sasakawa Scientific Research Grant
A master's student received the Outstanding Master's Thesis Award
A doctoral student received the Young Researcher Encouragement Award from the Theoretical Nuclear Physics Division of the Physical Society of Japan
A student received the NUSYS Outstanding Poster Award
ResearchResearch themes
The lab works on quantum many-body problems that arise in a wide variety of assemblies of fermions, including the structure and reactions of atomic nuclei, the physics of neutron stars, ultracold atomic gases, and superfluid phenomena. By combining new theories and ideas with numerical computation, it aims to discover and predict new phenomena.
*Illustrative imagePhysics of Neutron Stars
The lab is expanding the range of its activities by taking on new research problems related to the physics of neutron stars. Its work includes studying the inner layer of the neutron star crust (the inner crust) with a band theory that incorporates superfluidity.
*Illustrative imageNew Theory of Nuclear Reactions
The lab is developing a theory (stochastic mean-field theory) that appropriately describes the distributions of quantities observed in reactions between atomic nuclei.
*Illustrative imageQuantum Vortices in Ultracold Atomic Gases
The lab investigates how superfluidity behaves in spin-polarized atomic gases, in which unpaired particles remain. It simulated how quantum vortices and similar structures form and decay, as well as quantum turbulence in which vortices become entangled.
MembersFaculty
The members of the Sekizawa Lab consist of faculty, researchers, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorKazuyuki SekizawaPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Crab Nebula” NASA, ESA, J. Hester and A. Loll (Arizona State University) / Public domain (cropped)
- Physics of Neutron Stars: “Neutron star illustrated” Casey Reed - Penn State University / Public domain (cropped)
- New Theory of Nuclear Reactions: “Tabuleiros de Galton (antes e depois)” Estes Objethos Atelier、Rodrigo Tetsuo Argenton / CC BY-SA 4.0 (cropped)
- Quantum Vortices in Ultracold Atomic Gases: “Cloud of ultracold atoms levitated in a magneto-optical trap” Balping / CC BY-SA 4.0 (cropped)
- Related lab (中村研究室): “RIKEN Superconducting Ring Cyclotron P4213478” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (松尾研究室): “Dilution Refrigerator ( )” UCL Mathematical & Physical Sciences from London, UK / CC BY 2.0 (cropped)
- Related lab (花井研究室): “A starling murmuration - geograph.org.uk - 6389346” Walter Baxter / CC BY-SA 2.0 (cropped)
- Related lab (髭本研究室): “J-PARC muon experiment area” Kestrel / CC BY-SA 4.0 (cropped)
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