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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日本物理学会2022年秋
講演番号 登録番号 タイトル 著者 所属 領域 13pPSB-31 982 固有値の非線形性を持つ系のバルク境界対応 磯部拓磨, 吉田恒也, 初貝安弘 筑波大数理 領域4 15aH131-8 887 一般化された回転対称性のある系での例外点と判別式指標 若尾洋正, 吉田恒也, 初貝安弘 筑波大数理 領域4 15aH131-9 1257 一次元点ギャップトポロジーに対する強相関効果 吉田恒也, 初貝...
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Adiabatic connection with spin
Adiabatic connection of the gapped many-body states is a conceptual background of the topological phases. Historical and more than successful examples are given by various fractional quantum Hall stat...
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BEC seminar :工藤耕司氏 (Penn State) Aug.10, 2022
On Aug.10 (Wed) 2022 at 11:am Japan time, Koji Kudo at Penn State will be telling us about his recent study by a title : "Exactly solvable model for non-Abelian quasiparticle states." Join u...
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“b 2– 4 ac” formula with rotation symmetry
The discriminant is a generalization of the "b 2- 4 ac" formula that everybody knows, which tells us the degeneracy of the (secular) equation. Then it is natural the discriminant is useful f...
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Random flatbands are special
Recent wisdom for the construction of flat bands is applicable even with randomness. Characterization of special features of the random flat bands has been successfully done by using machine learning....
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APS March meeting 2022
APS March meeting, March 14-18 2022, Chicago USA Fractional charge pumping of anyons and the adiabatic heuristic principle Wed, March 16, 8:06 a.m.—8:18 a.m. Presenter: Koji Kudo(University of Tsukuba...
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日本物理学会2022年春
講演番号 登録番号 タイトル 著者 所属 領域 15aE22-8 529 拡張ボースハバード模型におけるトポロジカルポンプとバルクエッジ対応 久野義人A, B, 初貝安弘A 筑波大数理A, 秋田大B 領域1 15aT24-10 2043 カゴメ格子上の熱伝導 牧野柊星, 福井隆裕, 吉田恒也A, 初貝安弘A 茨城大, 筑波大A 領域4 17pPSE-3 496 光メタマテリアルにおけ...
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Heat escapes fast due to bulk-edge correspondence
Analyzing a diffusion equation of alternative metals, rapid heat conduction to the heat bath due to edge states is predicted. The edge states are predicted by the bulk topological invariant as a typic...
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Exact correlation of correlation
Once one admits the electronic state is described by the molecular-orbitals (MOs), the system has flat bands when the number of MOs is less than the total number of atoms. Then it is natural the elect...
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Discriminant and symmetry
As widely accepted, the degeneracy of eigenvalues of the Hamiltonian is a singular point, which is the source of the non-trivial topology. Then it is more than natural that the discriminant of the sec...
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Non Hermitian topology in game theory
The use of topological invariants for the characterization of material phases has been quite successful. Non-trivial topology is reflected by physical observables near the boundaries of systems as a b...
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First/second order topology in honeycomb lattice
The Haldane model with Kekulè distortion possesses various phases characterized by different topology with specific boundary states. Competition between the 1st/2nd order topology (1D/0D boundary stat...
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Flux attachement and bulk-edge correspondence
Adiabatic insertion of the Aharonov-Bohm flux through two pinholes introduces charge transport between them when the system is topologically non-trivial. This is the Laughlin argument. The defects/pin...
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第16回（2022年）日本物理学会若手奨励賞
助教の吉田恒也さんが第16回（2022年）日本物理学会若手奨励賞 (Young Scientist Award of the Physical Society of Japan)を受賞しました。 非エルミート性が誘起する強相関トポロジカル現象に関する先駆的研究 "Non-Hermitian perspective of the band structure in heavy-fermio...
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BEC Seminar 14:00-15:00 11月26日（金）2021年：松木義幸さん（大阪大学）
11月26日（金）に松木 義幸さん（大阪大学）さんに最近のご研究に関してお話し頂きます。(Zoom)。よろしくお願いいたします。ご興味のあります方は初貝（クリックしてください）までご連絡下さい。 "Fractal defect states in the Hofstadter butterfly"
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Multi-fold EP protected by anti-unitary symmetry
Generic degeneracy of a non-hermitian hamiltonian implies a set of the eigenvectors is not enough to span the total linear space. One needs to extend the idea of the eigenstates to the generic ones, w...
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3D HOTI of Hubbard model by negative sign free quantum Monte Carlo
Corner states of the breezing Pyrochlore lattice are protected by the Z4 symmetry as a typical example of the bulk-edge/boundary correspondence using Z4 Berry phase. With on-site Coulomb interaction, ...
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Bulk-edge correspondence of interacting bosonic pump
Topological (adiabatic) pumps are typical problems where the bulk-edge correspondence is justified. The Chern number of the bulk and the behavior of the edge states are linked intimately. As for most ...
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物質中のフラクタル Hofstadterの蝶
量子力学によると水素原子内の電子は勝手なエネルギーをとれず，離散的になることは高校の物理でも学ぶと思いますが，結晶のなかの電子のエネルギーもまた不連続な値しかとりません。結晶に強磁場を印加したとき，そのエネルギーの値を結晶の基本単位を貫く磁束を変えながら描くと，図のように拡大してもどんどん似たような絵が出てくるフラクタルな図となります。蝶に似てるので最初にこの絵を描いた人にちなんでホフスタッターの...
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日本物理学会秋季大会（2021）
2021年秋季大会 9/20-23 (2021) 講演番号 登録番号 タイトル 著者 所属 領域 21aL1-8 349 有限系の厳密な固有状態としてのエッジ状態 河原林透, 初貝安弘A 東邦大理, 筑波大物理A 領域11 21aL1-9 1421 量子ホール系の断熱変形とその応用 工藤耕司, 初貝安弘 筑波大数理 領域11 21pA1-4 1495 高次トポロジカル相におけるクエンチダイナミクス...
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