Recent News
- トポロジカル相に関する解説
- Yutaka Shikano will tell us about observation of identical particles
- 22nd International Conference on Recent Progress in Many-Body Theories (RPMBT22)
- 日本物理学会第79回年次大会（2024年）（北海道大学）
- Z3 Berry phases for quantum spins
- Non-uniform flux and particle blocking
- トポロジカル物質の物理と数理
- Our new member, Kazuki Sone, will tell us on edge states of non-linear systems
- 外部資金（2024）
- Bulk-edge correspondence for energy dependent systems/nonlinear eigen value problems
- 日本物理学会 2024年春季大会
- SKCM² Spring Symposium: Nara, Japan
- APS March meeting 2024
- 外部資金（2023）
- Bulk-edge correspondence (Encyclopedia of condensed matter physics, 2nd Ed.)
- 137は大きい…
- TTQM2023 Kashiwa
- 第68回物性若手夏の学校（原稿追加）
- 日本物理学会第78回年次大会 9/16-9/19（2023年）東北大学、仙台
- Nontrivial Topology of Nontopological Nonlinear Waves
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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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Heat carrying corner states of breathing Kagome
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 ...
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Z2× Z2 symmetry and Z4 quantization in bosonic ladders
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...
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Hidenori Fukaya will be telling us on dyon & topological insulators
Condensed Matter Seminar 物性論セミナー 2023年6月29日 (木), June29 (Thu.) 2023 10:30-11:30 Zoom https://us02web.zoom.us/j/88914003345?pwd=S096bldkZkd6QTNSL2h2WTl3d0RSdz09 Meeting ID: 889 1400 3345 Passcode: 6625...
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Negative index photonic crystal induces non hermitian physics
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...
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Diophantine equation of SU(Q) topological pump
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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初貝研（筑波大学大学院 物理学学位プログラム 量子物性理論）オープンキャンパス（説明会）
修士、博士の大学院入学を希望される学生さん向けに研究室でやっていることなどを説明します。希望者は以下の何れかのzoomリンクにて入室してください。連絡なしでも参加可能としますが、事前に説明会参加希望とメールをもらえるとよりスムーズです。また、個別に相談したい人もメールをください。 Topic: 初貝研（量子物性理論）オープンキャンパス：その一 Time: May 23, 2023 04:00 PM...
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令和四年度 筑波大学大学院数理物質科学研究群 学位記授与式 式辞
本日、筑波大学から博士の学位を授与された皆さん、大変おめでとうございます。入学以来日々の研鑽を重ね、本日の学位授与にいたるまでの努力の結果、学位取得に至ったこと真に喜ばしく、教職員を代表しまして心よりお祝い申し上げます。 この３年間を振り返ると、この期間はコロナウイルス感染症が世界的に蔓延した期間に重なり、厳しく制限された活動のみしか行えない時期でした。学生の皆さんのみならず教員にとっても、今まで...
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日本物理学会2023年春期大会 令和5年（2023年）3月22日（水）～25日（土）
25pA1-3 259 例外点における強相関効果 吉田恒也, 初貝安弘A 京大理, 筑波大数理A 領域1 22aD1-5 2023 2点修飾ハニカム格子における平方根高次トポロジカル絶縁体 松本大輝, 溝口知成, 初貝安弘 筑波大数理 領域4 24pPSD-5 649 固有値の非線形性とカイラルゼロモード 磯部拓磨, 吉田恒也A, 初貝安弘 筑波大数理, 京大理A 領域4 24pPSD-7 130...
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APS March meeting 2023
APS March meeting, March 5–10, 2023 | Las Vegas, Nevada March 20–22, 2023 | Virtual Emergence of the non-Hermitian topology in generalized eigenvalue problems with Hermitian matrices Mon. March 6, 11:...
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Graphene, silicene and martini
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...
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Array of Martini glasses with topology
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...
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Novel critical states in random U(1) MO models in 2D
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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Anyon superconductivity revisited : talk by Koji Kudo
Next Wednesday, Feb. 15 (2023), Koji Kudo (Penn state) visits us and will be telling on anyon superconductivity. The talk is hybrid. For the zoom link, contact me (email). Speaker: Koji Kudo Pennsylv...
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Topological strucure can be fragile against interactions
Topological protection of singularities for the non-Hermitian problem is one of the recent focuses in condensed matter physics. Exceptional points and rings with symmetry constraints are typical examp...
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Seminar by Tomonari Mizoguchi
Coming Wed. afternoon, 13:00, Dec.14, Tomonari Mizoguchi (Univ. Tsukuba) will be telling us about his work in collaboration with N. Okuma (Kyoto Univ.). The seminar is in a hybrid format. Please conta...
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Reduction of non-Hermitian 1D topology with interaction
Topological protection for topological systems may change by the inclusion of particle-particle interaction, which is known as "reduction phenomena." Here we have pointed out its possibiliti...
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Bulk-edge correspondence in electric circuits of topological pump
One of the recent wisdom for topological phases is the use of a classical system as a quantum simulator. The Hofstadter butterfly associated with topological phase transitions is realized in electric ...
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