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アクセス数 Since 2009
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Who am I ?
初貝 安弘
筑波大学
数理物質系物理学域長
筑波大学大学院
数理物質科学研究科
物理学専攻 教授
物理学専攻長
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YasuhiroV.jpg
会議 & 研究会
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ResercherID: Y. Hatsugai
Project
メインメニュー
23rd International Conference on High Magnetic Fields in Semiconductor Physics (HMF-23), Toulouse,France 22 – 27 July (2018)
T. Kawarabayashi and Y. Hatsugai
Topological order in quantum phases in anisotropic Kagome magnets
K. Kudo and Y. Hatsugai
Halperin 331 state of the FQH system of the n=0 Landau band of graphene
H. Araki, T. Fukui and Y. Hatsugai
Topological phase of the strained HgTe from the entanglement Hamiltonians and the First-principles calculations
前
[P] 34-th international conference on the physics of semiconductors (ICPS 2018), Corum, Montpellie, July 29-August 3, (2018)
カテゴリートップ
国際会議、研究会、セミナー
次
[P] 3rd informal meeting, KAKEN-HI, BEC, May 19-20 (2018)

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現在の時刻
今年もやります。まずは量子力学3. 冬は 統計力学2. 平成31年の新年あけましておめでとうございます。今年もあと79日!
最新ニュース
投稿者 : hatsugai 投稿日時: 2019-09-30 11:19:28 (106 ヒット)

Exact flatness of energy bands implies some reasons behind. Here we present one of them, "molecular orbital (MO) representation", which seems to be applied for various classes of tight binding models. Mathematically if the rank of the hamiltonian as a linear operator is less than the number of atomic sites, the kernel of the linear operator has a finite dimension. This is the zero mode flat band. The MO rep. presents nice physical reasons for it. Original proposal by YH with Isao Maruyama in 2011 in EPL and arXiv is counting dimensions of non-orthogonal projections but the hopping of the MO's is allowed as we pointed out (it should be). It's a fun to guess what kinds of the MO representation is possible for a known flat band system. Try ! Also several physical reason why the flat band crosses/touches to dispersive bands in many cases are discussed. Our new paper has appeared in EPL, "Molecular-orbital representation of generic flat-band models", by T. Mizoguchi and Y. Hatsugai , also arXiv.


投稿者 : hatsugai 投稿日時: 2019-09-10 11:03:57 (101 ヒット)

I wrote a small article "So Small Implies So Large: For a Material Design" in the "News and comment" section of the JPSJ in relation to a recent interesting paper by Toshikaze Kariyado. Material deformation induces a gauge field that modifies electronic structure and may result in the Landau levels without breaking time reversal. Have a look at.


投稿者 : hatsugai 投稿日時: 2019-09-09 22:11:58 (107 ヒット)

Our paper "Higher-Order Topological Phase in a Honeycomb-Lattice Model with Anti-Kekulé Distortion" by Tomonari Mizoguchi, Hiromu Araki, and Yasuhiro Hatsugai, has appeared in J. Phys. Soc. Jpn. 88, 104703 (2019). One can access also via arXiv:1906.07928. Z6 quantization in honeycomb structure is the key. Have a look at.


投稿者 : hatsugai 投稿日時: 2019-08-26 14:24:32 (149 ヒット)

Ryo Okugawa (WPI-AIMR, Tohoku Univ.) will be telling us on his recent work as a title "Chiral-symmetry protected second-order topological phases" on Sep. 18 (2019). Rm. D301 from 13:30pm. Join us.


投稿者 : hatsugai 投稿日時: 2019-08-08 00:43:18 (152 ヒット)

Due to an intrinsic symmetry of a mechanical system with friction governed by the Newton equation, exceptional rings appear in two dimensions. We have demonstrated it and classification of symmetry-protected non-Hermitian degeneracies is addressed putting a focus on the symmetry. The paper is published in Physical Review B, "Exceptional rings protected by emergent symmetry for mechanical systems" by Tsuneya Yoshida and Yasuhiro Hatsugai. You may find also here arXiv:1904.10764.


    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)
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