News

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!)...

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

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.

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 [pdf] 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 integers P...

Funding 2023

2023.4.21

KAKEN KAKEN DB Yasuhiro Hatsugai Grant-in-Aid for Scientific Research (B): Symmetry and bulk-edge correspondence of strongly correlated systems Project/Area Number: 23H01091 JPY 13,260,000 (Direct Cos...

JPS Spring Meeting 2023

2023.3.20

Meeting site

APS March meeting 2023

2023.3.5

APS March meeting, March 5–10, 2023 | Las Vegas, Nevada March 20–22, 2023 | Virtual

Graphene, silicene and martini

2023.2.22

Chemisorption on graphene and silicene may realize Martini type π-electron network. It implies specific band dispersion. We propose potential materialization by using the molecular orbital constr...

Array of Martini glasses with topology

2023.2.22

Taking a square root is not trivial. The Dirac equation is invented by the square root of the Kleind-Gordon equation. Then the lattice analog of the operation implies non-trivial　topology and edge/cor...

Novel critical states in random U(1) MO models in 2D

2023.2.22

Using a molecular orbital (MO) construction scheme of the flat band which we are proposing, we found novel random critical states in a series of flat band systems away from the flat band energy. The M...

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