ZN Berry phases of Pyrochlore magnet
Various symmetry-protected topological phases of quantum spins on a breathing Pyrochlore are discussed by the Quantum Monte Carlo method. ZN Quantized Berry phases( N=2,3,4,6) are directly evaluated a...
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Orbital magnetism and quantum geometry: Talk by Frédéric Piéchon
We will have a guest, Prof. Frédéric Piéchon (Université Paris-Saclay). He will tell us about "Orbital magnetism and quantum geometry". Please join us. 15:00-16:0...
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Kagome lattice is chiral symmetric
Chiral symmetry in condensed matter physics implies the sublattice symmetry (as far as the one-particle hopping Hamiltonian is concerned). Then the usual belief is that the nearest neighbor hopping Ha...
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Exceptional points of metamaterials induced by nonlinearity of eigenvalues
Exceptional points (Eps) are common in metamaterials if one generically considers nonlinearity of eigenvalues that is also quite common in reality. We have considered these kinds of EP topologically a...
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Recent progress in Quantum Computing: Talk by Nobuyuki Yoshioka
We will have a guest, Prof. Nobuyuki Yoshioka (Univ. Tokyo). He will tell us about "Recent progress in Quantum Computing". Please join us. Speaker: Nobuyuki Yoshioka (The University o...
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Yutaka Shikano will tell us about observation of identical particles
We will have Prof. Yutaka Shikano for our coming seminar on Oct. 8, 2024. He will tell us about a fundamental problem of quantum mechanics. Title: "On Observer-Dependent Description of Quantum St...
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22nd International Conference on Recent Progress in Many-Body Theories (RPMBT22)
We are organizing an international conference "Recent Progress in Many-Body Theories (RPMBT22)", Kasuga Campus, University of Tsukuba, on 23-27 September 2024. The site is here.
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2024 JPS Fall meeting
2024 Japanese physical society Annual meeting, Hokkaido Univ. Sapporo, JAPAN
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Z3 Berry phases for quantum spins
Z3 Berry phases for XXZ quantum spins on Kagome lattice are calculated by the quantum Monte Carlo method under a condition with fixed magnetization. The phase diagram of the model is discussed by usin...
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Non-uniform flux and particle blocking
Spatial variation of physical parameters may induce rich phenomena, which can only be realized in artificial structures by meta-materials and cold atoms. Non-uniform flux associated with particle bloc...
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Our new member, Kazuki Sone, will tell us on edge states of non-linear systems
We have a new member, Kazuki Sone (Assistant Prof.) from this April. He will be telling us on his series of works on edge states of non-linear systems. Onsite, 15:00-16:00, D301, Univ. Tsukuba (link!)...
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Funding 2024
KAKEN KAKEN DB Yasuhiro Hatsugai Grant-in-Aid for Scientific Research (B): Symmetry and bulk-edge correspondence of strongly correlated systems Project/Area Number:23K25788, 23H01091 (2023) JPY 13,260...
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Bulk-edge correspondence for energy dependent systems/nonlinear eigen value problems
The recent development of a topological description of matter, especially for classical systems, is based on the formal analogy to quantum mechanics. The differential equation governing the classical ...
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SKCM² Spring Symposium: Nara, Japan
Invited Talk: Yasuhiro Hatsugai, "Bulk-edge correspondence for topological materials : Experimental access to linking", WPI-SKCM² Spring Symposium, March 8 - 10 (2024), Nara, Japan
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APS March meeting 2024
American Physical Society March Meeting, March 3 - 8, 2024 Minneapolis & Virtual Quantitative characterization of flat band states in a molecular orbital model via hyperuniformity Thu. March 7, 5:...
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Bulk-edge correspondence (Encyclopedia of condensed matter physics, 2nd Ed.)
I wrote a chapter on the bulk-edge correspondence in Encyclopedia of condensed matter physics, 2nd Ed.,Volume 1, 2024, Pages 659-669, Its abstract is free.
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TTQM2023 Kashiwa
We are organizing TTQM2023 (Trends in the Theory of Quantum Materials) as a continuation of the Japan-Swiss bilateral workshop for mainly theoretical condensed matter physicists. It is at Kashiwa this...
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The Physical Society of Japan, Annual meeting 9/16-9/19 (2023), Tohoku Univ.
Japan Physical Society Annual meeting 9/16-9/19 (2023)
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Nontrivial Topology of Nontopological Nonlinear Waves
I have written an article for JPSJ News & Comments. Have a look at "Nontrivial Topology of Nontopological Nonlinear Waves." See also old ones. "Y. Hatsugai, News Comments 20, 10 (20...
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Shiro Sakai will tell us on hyperuniformity !
Shiri Sakai (CEMS, RIKEN) will be telling us on their recent works on the hyperuniformity and quasi-crystals. It's a new idea. The talk is on Aug. 30 (Wed). See for its detail. Come and join us.
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