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| Yasunori Hatsugai | |
|---|---|
| Name | Yasunori Hatsugai |
| Nationality | Japanese |
| Fields | Theoretical physics |
| Workplaces | University of Tsukuba |
| Alma mater | University of Tokyo |
| Known for | Studies of topological phases, edge states, bulk–boundary correspondence |
Yasunori Hatsugai
Yasunori Hatsugai is a Japanese theoretical physicist known for pioneering work on topological phases of matter, the bulk–boundary correspondence, and edge states in condensed matter physics. His research intersects with developments in quantum Hall effects, topological insulators, and lattice gauge theories, influencing both theoretical frameworks and interpretations of experiments at institutions such as the University of Tokyo and the University of Tsukuba. Hatsugai’s ideas have been widely cited alongside work by researchers at institutes like the Massachusetts Institute of Technology, the Kavli Institute for Theoretical Physics, and the Max Planck Institute for the Physics of Complex Systems.
Hatsugai completed undergraduate and graduate training at the University of Tokyo, where he studied under faculty associated with the Institute for Solid State Physics (Japan). During the late 1980s and early 1990s, his education overlapped historically with advances by scholars at Bell Labs, the University of Chicago, and the University of Cambridge in quantum Hall physics and topological order. His doctoral work engaged concepts developed in the context of the Thouless–Kohmoto–Nightingale–den Nijs formulation and paralleled contemporary research by groups at the Princeton University condensed matter theory community and the California Institute of Technology.
Hatsugai held positions at the University of Tsukuba where he served as a faculty member in theoretical physics, contributing to collaborative programs with laboratories including the RIKEN Condensed Matter Theory Division and the Japan Society for the Promotion of Science. He visited and collaborated with researchers at the International Center for Theoretical Physics, the Institute for Advanced Study, and the National Institute for Materials Science. His career includes seminars and extended visits to departments at the Harvard University physics department, the ETH Zurich condensed matter group, and the Niels Bohr Institute, fostering exchange with researchers working on Chern number calculations, lattice models, and numerical simulations.
Hatsugai is best known for formulating a rigorous bulk–boundary correspondence that relates bulk topological invariants to localized boundary modes in lattice systems, complementing results by scholars studying the Quantum Hall effect, Chern insulator, and topological insulator classes. He introduced methods to identify edge states in tight-binding models and to compute topological indices by tracking zero modes, bridging ideas from the Atiyah–Singer index theorem tradition with lattice realizations explored by researchers at the University of California, Berkeley and Los Alamos National Laboratory. His analyses of edge-state spectra clarified the role of chiral symmetry and particle–hole symmetry recognized in classes catalogued by the Altland–Zirnbauer classification and connected to numerical studies at the Weizmann Institute of Science.
Hatsugai developed computational techniques for evaluating the Chern number and related invariants on discretized Brillouin zones, advancing practical tools parallel to approaches adopted by groups at the National Institute of Standards and Technology and the University of Illinois Urbana-Champaign. He contributed to theoretical descriptions of zero-energy modes in graphene-like lattices, relating to experimental efforts at the IBM Research centers and theoretical proposals from the Royal Society-affiliated communities. His work on topological protection and localized boundary excitations influenced later investigations into Majorana fermions in superconducting heterostructures pursued at the University of Copenhagen and Stanford University.
Hatsugai authored seminal papers that have been cited in reviews from the American Physical Society journals and in monographs from publishers associated with the Oxford University Press and Cambridge University Press. Key articles explore edge modes in lattice models and formulations of bulk–boundary correspondence that are routinely referenced alongside foundational works such as the Kane–Mele proposals and the Haldane model. His publications were distributed through venues including Physical Review Letters, Physical Review B, and conference proceedings connected to the International Conference on Strongly Correlated Electron Systems and workshops at the Kavli Institute for Theoretical Physics.
Hatsugai’s contributions have been recognized by national and international forums; his career includes invitations to speak at the Gordon Research Conferences, the International Congress on Mathematical Physics, and plenary lectures at symposiums hosted by the Japan Physical Society. He has received competitive research grants from agencies like the Japan Society for the Promotion of Science and acknowledgments from collaborative centers including the CREST program of the Japan Science and Technology Agency.
Hatsugai’s formulation of bulk–boundary correspondence and techniques for identifying topological invariants on lattices have become standard tools in the study of topological phases, influencing work at institutions such as the University of California, Santa Barbara, the Max Planck Institute for the Physics of Complex Systems, and the Institute for Theoretical Physics (Utrecht). His ideas underpin theoretical explorations of topological superconductivity, photonic crystals researched at the California Institute of Technology and Stanford University, and cold-atom simulations at facilities like the Max Planck Institute of Quantum Optics and MIT-Harvard Center for Ultracold Atoms. The concepts he advanced remain central to ongoing collaborations between condensed matter theorists and experimental groups at the Argonne National Laboratory and the European Organization for Nuclear Research that probe topological materials and emergent quasiparticles.
Category:Japanese physicists Category:Theoretical physicists Category:Condensed matter physicists