Recent News
- Recent progress in Quantum Computing: Talk by Nobuyuki Yoshioka
- 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
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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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物性物理学（大学院）2021年春AB
固体物理における電子相関の物理の基礎(第二部初貝担当分) いわゆるバンド理論で記述できない電子間の相互作用が本質的な現象として、磁性と超伝導を取り上げ、その基礎を学ぶ。 講義ノート 1.第2量子化 2.磁性 3.超伝導 参考書は，例えば 斯波弘行 （新版）「固体の電子論」 近藤淳 「金属電子論」 J. R. Schrieffer "Theory of Superconductivity&...
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Non real energies for Hermitian problems
Eigenvalues may not be always real for generalized eigenvalue problems even if the Hamiltonian and overlap matrices are both Hermitian. When the overlap is associated with a norm of physical state, th...
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Multiple quantum scars and dynamics
A flat band system with interaction that possesses a single "quantum scar", which we have proposed in Kuno-Mizoguchi-Hatsugai, Phys. Rev. B 102, 241115(R) (2020), is extended to a system wit...
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One more topological phase with chiral edge states
Bulk-edge correspondence is universal. We do find a novel playground of the chiral edge states protected by bulk topology. It is in the evolutionary game theory realized in a kagome network. The paper...
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Flat bands of COF/MOF in any dimension
Covalent/Metal-organic framework (COF/MOF) is a 2D/3D network compound of organic molecules (linkages) connected by linker molecules. This material possesses a set of flat bands (at least in a tight-b...
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Flat bands and spin-1 Dirac cone
We are proposing one more lattice structure with frustration that hosts flat bands, square-Kagome lattice. Using a molecular orbital representation, its flat band and flat dispersion only in some spec...
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Reduction of non-hermitian topology in 0-D
Many body interactions may modify the topology of physical systems. We have discussed it for a simple 0-D system with non-hermitian hamiltonian. Have a look at our recent paper, "Correlation effe...
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分子軌道表現と第三種ディラックコーン
雑誌「固体物理」No.7 (通巻665号)のトピックス欄に助教の溝口知成さんと記事を書きました。溝口知成・初貝安弘 分子軌道表現」を用いた第3種ディラックコーンの統計的構成法。ご覧下さい。
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Non-real energies in real world
Our paper on non-real things has been picked up by JPS Hot Topics. It's real.
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Plateau transitions of quantum spin chain
Quantum mechanics tells us particles are waves at the same time. One may then naively expect that the quantum state is extended, especially with translational invariance. However, it is not always tru...
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Symmetries and square-root operation
Motivated by the relation between the Dirac/Schrodinger hamiltonians, the square root topological phase (SRTI) has been discussed in several cases recently. Here the roles of symmetries in SRTI are fo...
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Square root semimetals
We propose topological semimetals generated by the square-root operation for tight-binding models in two and three dimensions, which we call square-root topological semimetals. The square-root topolog...
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Bulk-edge correspondence with generalized chiral symmetry
Dirac cones are generically tilted when realized in a realistic material. This gapless structure is effectively protected by the generalized chiral symmetry. It induces topological edge states when th...
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Revisiting Flat bands and localization
Flat bands cannot be accidental. Physically, it implies that the itinerancy of the system is not sufficient. Formal reasons are given by a molecular orbital (MO) representation which we are proposing....
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Kekule ordering and zero modes with disorder
Zero modes of chiral symmetric systems are stable as for symmetry preserving disorder. On a honeycomb lattice with Kekule ordering, we have demonstrated this stabilities numerically. It has been pubis...
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トポロジカルフォトニクスへの期待
日本光学会(OSJ)学会誌「光学」第49巻11号(2020年11月)「トポロジーが織りなす光学現象とその応用」に巻頭言を書かせて頂きました。「トポロジカルフォトニクスへの期待」（初貝 安弘）
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Machine learning for mirror skin effects
Robustness of the mirror skin effects against for randomness breaking the symmetry is demonstrated by machine learning. The letter has been published in J. Phys. Soc. Jpn. 90, 053703 (2021) by Hiromu ...
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外部資金（2021）
科学研究費補助金 科研費データベース 初貝安弘 プロジェクト 基盤研究S : トポロジカル相でのバルク・エッジ対応の多様性と普遍性：固体物理を越えて分野横断へ 研究課題番号：17H06138 205,140千円 (直接経費 : 157,800千円、間接経費 : 47,340千円) May 31, 2017 - March 31, 2022 2021年度: 36,530千円 (直接経費: 28,10...
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Diffusion as a new platform of bulk-edge correspondence
Diffusion in non-equilibrium phenomena is typical and universal. Any unbalance away from the equilibrium is always/necessarily relaxed to the steady state. Here non-uniform (periodic) modulation of th...
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