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Who am I ?
初貝 安弘 筑波大学筑波大学大学院 数理物質科学研究科 物理学専攻 教授 初貝写真
会議 & 研究会
グーグル検索:初貝
ResercherID: Y.Hatsugai
Project
メインメニュー
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- 基盤研究B:幾何学的位相による物質相:量子液体及びグラフェンでの応用と展開
研究課題番号:23340112- April 2011 - March 2014
- Project leader :
- 初貝 安弘 (筑波大学教授)
- Member :
- 青木 秀夫 (東京大学教授)
- 河原林 透 (東邦大学教授)
- 島野 亮 (東京大学准教授)
- 岡 隆史 (連携研究者:東京大学)
- 丸山 勲 (連携研究者:福岡工業大学)
- 苅宿 俊風 (連携研究者:筑波大学)( 2013, 2014)
- 濱本 雄治 (連携研究者:筑波大学)( 2011, 2012, 2013)
- Meeting
- 1. Get together Meeting (Informal)
- [program] in Japanese
- 2011年5月23日(月)13:00から
- 東大理学部1号館9階、933号セミナー室
- 2. Quantum liquids and graphene physics (English)
- [program] in English
- 2012年2月16日(木)13:00から
- 筑波大学総合研究棟B棟、B107
- 3. Recent topics on Quantum liquids and graphene (Informal, closed)
- [program] in Japanese
- 2012年6月18日(月)13:30から
- 東大理学部1号館4階414号室
- 4. Quantum effects in graphene and related material(English, Informal)
- [program]
- 2013年3月19日(火)13:00から
- 筑波大学総合研究棟B棟公開講義室B110
- 5. Physics of graphene 2013 (Japanese, Informal)
- [program]
- 2013年6月19日(水)16:00から
- 東大理学部1号館4階431号室
- 6. Physics of graphene 2014 (Japanese, open)
- [program]
- 2014年3月24日(月)13:00から
- ]筑波大学総合研究棟B棟公開講義室B110
Conference Presentations- [1] Graphene Week 2011: Fundamental Science of Graphene and Applications of Graphene-Based Devices, 24-29 April 2011, Obergurgl, Austria
- [detail]
- [2] Electronic Properties of Two-Dimensional Systems 19 (EP2DS 19) 25-29 July, 2011, Tallahassee, Florida, USA
- [detail]
- [3]LT26
- [4]Graphene week 2012
- [5]EP2DS 20
- [6]ICPS
- [7] ... and more.
IV. 対称性の破れを伴わない量子液体相 (終了) April 2008 - March 2011 (Finished)
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研究
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VI. トポロジカル相におけるバルク・エッジ対応の物理とその普遍性:固体物理から冷却原子まで (終了) April 2014 - March 2017
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モバイル機器でご覧の方
現在の時刻
今年もやります。まずは 量子力学3(遠隔).
冬は
統計力学2 改め物性理論II (大学院「ベリー接続の理論とバルクエッジ対応」).
令和二年の新年あけましておめでとうございます。今年もあと-1183日!
最新ニュース
投稿者 : hatsugai 投稿日時: 2020-11-03 10:00:50 ( 4760 ヒット) Thouless' (adiabatic) pump in one-dimension is a typical topological phenomena characterized by the Chern number that correspondes to the quantized motion of the center of mass (COM). Although the COM is only well-defined with boudary (to set the origin of the coordinate), the COM experimentally observed is given by the bulk and the edge states do not contribute. Ultimate adiabaticity, that has never been achieved experimentaly, supports the quantization of the COM supplemented by the periodicity of the system with boundaries. This is the unique bulk-edge correspondence of the pump. We here propose a generic construction using a phase boundary line of the symmetry protect phase with two parameters works as a topological obstruction of the pump in extended parameter space. The construction is purely of manybody and the interaction can be one of the parameters. Have a look at "Interaction-induced topological charge pump" by Yoshihito Kuno and Yasuhiro Hatsugai, Phys. Rev. Research 2, 042024(R), (2020) (Open access) 投稿者 : hatsugai 投稿日時: 2020-10-01 16:07:56 ( 5231 ヒット) Motivated by a historical example, the Dirac Hamiltonian as a square-root of the Klein-Gordon Hamiltonian, its lattice analogue has been discussed recently. Zero energy states are shared by the parent and its descendant. The story is more than that. Not necessarily zero energy but its high energy part can also share topological characters. We hereby propose a “square-root higher order topological insulator (square-root HOTI)” when its squared parent is HOTI. Based on the simple observation that square of the decorated honeycomb lattice is given by a decoupled sum of the Kagome and honeycomb lattices, we have demonstrate that the “corner states” of the breezing Kagome lattice with boundaries share topological characters with its descendant as the decorated honeycomb lattice. Have a look at our recent paper just published online, "Square-root higher-order topological insulator on a decorated honeycomb lattice" by Tomonari Mizoguchi, Yoshihito Kuno, and Yasuhiro Hatsugai, Phys. Rev. A 102, 033527 (2020), also arXiv:2004.03235. 投稿者 : hatsugai 投稿日時: 2020-08-16 14:53:28 ( 5425 ヒット) Adiabatic deformation of gapped systems is a conceptual basis of topological phases. It implies that topological invariants of the bulk described by the Berry connection work as topological order parameters of the phase. This is independent of the well-established symmetry breaking scenario of the phase characterization. Adiabatic heuristic argument for the fractional quantum Hall states is one of the oldest such trials that states the "FRACTIONAL" state is deformed to the “INTEGER”. Although it is intuitive and physically quite natural, there exist several difficulties. How the states with different degeneracy are deformed each other adiabatically? We have clarified the questions and demonstrated this adiabatic deformation on a torus in the paper "Adiabatic heuristic principle on a torus and generalized Streda formula" by Koji Kudo and Yasuhiro Hatsugai , Phys. Rev. B 102, 125108 (2020) (also arXiv:2004.00859) What is deformed continuously is a gap not the states ! This is also sufficient for the topological stability of the Chern number (of the degenerate multiplet) as a topological order parameter. Have a look at. 検索
バルク・エッジ対応
- [0] バルクとエッジ
- [1] 集中講義
- [2] 原論文と解説
- [3] トポロジカル秩序とベリー接続:日本物理学会誌 「解説」 [JPS-HP] [pdf]
- [4] "Band gap, dangling bond and spin : a physicist's viewpoint" [pdf] [Web]
トポロジカル相
[0]昔の科研費 - 科研費 1992年度:電子系スピン系におけるトポロジカル効果
- 科研費 1994年度:物性論におけるトポロジーと幾何学的位相
私の講演ファイルのいくつか- [1] MIT, Boston (2003)
- [2] APS/JPS March Meeting (2004)
- [3] JPS Fall meeting, JAPAN (2004)
- [4] APS/JPS March meeting (2005)
- [5] JPS Fall meeting (2005):Entanglement
- [6] Superclean workshop, Nasu (2006)
- [7] MPIPKS, Dresden (2006)
- [8] KEK, Tsukuba (2007)
- [9] ETH, Zurich (2008)
- [10] ICREA, Sant Benet (2009)
- [11] JPS Meeting, Kumamoto (2009)
- [12]HMF19, Fukuoka (2010)
- [13] NTU, Singapore (2011)
- [14] ICTP, Trieste (2011)
- [15] Villa conf., Orland (2012)
Web記事 カテゴリ一覧
最新のエントリ
- 原点(2019-3-13 6:36)
- 久しぶりにグラフェンとは?(2013-9-16 23:19)
- 2012年度大学大学説明会:教員からのメッセージ(2012-6-14 16:29)
- 平成23年度 筑波大学理工学群物理学類学位授与式 物理学類長祝辞(2012-4-5 10:29)
- 物理学はじめの一歩 (2011-4-25 11:46)
- 2次元と3次元でぐるぐる(2010-8-20 0:40)
- クラマース縮退と四元数的ベリー接続(2010-7-6 10:19)
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