News

Yutaka Shikano will tell us about observation of identical particles

2024.9.29

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...

22nd International Conference on Recent Progress in Many-Body Theories (RPMBT22)

2024.8.22

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.

2024 JPS Fall meeting

2024.8.7

2024 Japanese physical society Annual meeting, Hokkaido Univ. Sapporo, JAPAN

Z₃ Berry phases for quantum spins

2024.5.22

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...

Non-uniform flux and particle blocking

2024.5.4

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...

Our new member, Kazuki Sone, will tell us on edge states of non-linear systems

2024.4.8

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!)...

Funding 2024

2024.4.3

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...

Bulk-edge correspondence for energy dependent systems/nonlinear eigen value problems

2024.3.19

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 ...

SKCM² Spring Symposium: Nara, Japan

2024.3.7

Invited Talk: Yasuhiro Hatsugai, "Bulk-edge correspondence for topological materials : Experimental access to linking", WPI-SKCM² Spring Symposium, March 8 - 10 (2024), Nara, Japan

APS March meeting 2024

2024.3.7

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:...

Bulk-edge correspondence (Encyclopedia of condensed matter physics, 2nd Ed.)

2023.12.14

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.

TTQM2023 Kashiwa

2023.9.28

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...

The Physical Society of Japan, Annual meeting 9/16-9/19 (2023), Tohoku Univ.

2023.9.14

Japan Physical Society Annual meeting 9/16-9/19 (2023)

Nontrivial Topology of Nontopological Nonlinear Waves

2023.8.22

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...

Shiro Sakai will tell us on hyperuniformity !

2023.8.18

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.

Heat carrying corner states of breathing Kagome

2023.7.20

Heat conduction of the breathing Kagome lattice is discussed in relation to the anomalous heat-carrying corner states due to higher-order topology. Especially the use of the effective Hamiltonian for ...

Z2× Z2 symmetry and Z4 quantization in bosonic ladders

Z₂× Z₂ symmetry and Z₄ quantization in bosonic ladders

2023.7.14

A two-leg ladder is a nice place to discuss Z2× Z2 symmetry with sufficient numerical accuracy. Using a Z4 Berry phases, several phases of bosonic ladders are discussed in relation to the bulk-edge co...

Hidenori Fukaya will be telling us on dyon & topological insulators

2023.6.17

Condensed Matter Seminar June 29 (Thu.) 2023 10:30-11:30 Zoom https://us02web.zoom.us/j/88914003345?pwd=S096bldkZkd6QTNSL2h2WTl3d0RSdz09 Meeting ID: 889 1400 3345 Passcode: 662572 Title:Why monopole b...

Negative index photonic crystal induces non hermitian physics

2023.6.15

An electromagnetic field in a photonic crystal is described by a hermitian eigenvalue problem with an overlap matrix which may not be positive definite if the system is composed of negative index medi...

Diophantine equation of SU(Q) topological pump

2023.6.2

A topological pump of SU(Q) interacting fermions is proposed based on Affleck's SU(Q) quantum chains associated with a symmetric breaking term characterized by a parameter P/Q with co-prime intege...

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