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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
初貝写真
Yasuhiro-Nov11-2009
会議 & 研究会
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ResercherID: Y. Hatsugai
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メインメニュー
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: 2019-07-27 17:21:02 (250 ヒット)

8月8日(木)15:00から東京大学/産総研の青木秀夫先生に最近のご研究についてのセミナーをお願いいたしました。「平坦バンド模型における超伝導およびトポロジカル系の設計」。場所は自然系学系棟B棟6階602号室となっております。是非ご参加ください。


投稿者 : hatsugai 投稿日時: 2019-07-08 09:51:39 (281 ヒット)

NTTI2019 & BEC 2019 at Hiroshima, July 14-19 (2019) is coming. We have organized a series of international workshops BEC2015, 2016, 2018, 2018X. This year, we have a joint international workshop with NTTI as NTTI2019 & BEC2019 at Hiroshima. Join us.


投稿者 : hatsugai 投稿日時: 2019-06-11 16:12:43 (262 ヒット)

Jyong-Hao Chen (ETH, PSI & ISSP) will be telling us on his recent work as a title "Model of spin liquids with Abelian and non-Abelian topological phases" on June 19 (2019). Rm. D301 from 13:30pm. Join us.


投稿者 : hatsugai 投稿日時: 2019-04-24 17:39:37 (327 ヒット)

Shintaro Hoshino will be telling us about "Spectral bulk-boundary correspondence and topological criticality in chiral-symmetric superconductors" on May 15 (2019). Join us.


投稿者 : hatsugai 投稿日時: 2018-12-06 22:57:18 (583 ヒット)

Yuji Matsuda (Kyoto Univ.) will be telling us about their discoveries on Dec. 14 entitled as "Majorana fermions and half-integer thermal quantum Hall effect in a quantum spin liquid". Its detail is here. Join us !


投稿者 : hatsugai 投稿日時: 2018-12-05 17:03:35 (360 ヒット)

Nobuyuki Okuma (Kyoto Univ.) will tell us in a long seminar entitled as "Real-Space Topological Classification: Higher-order topology and Atiyah-Hirzebruch spectral sequence" on Dec.19. The detail is here. Join us.


投稿者 : hatsugai 投稿日時: 2018-11-12 17:21:21 (548 ヒット)

Shutaro Sumita (Kyoto Univ.) will talk on "Classification of topological crystalline superconducting nodes on high-symmetry axis" on Nov. 28. The detail is here. Join us.


投稿者 : hatsugai 投稿日時: 2018-11-06 11:31:20 (832 ヒット)

We will organize an international workshop : Variety and universality of bulk-edge correspondence 2018X (BEC2018X) , Dec.9-Dec.13 (2018) Tokyo Campus, Univ. Tsukuba. The registration is open for oral/poster contribution. Please visit the site. We also welcome participation without presentation (still please register). It is free.


投稿者 : hatsugai 投稿日時: 2018-10-03 15:59:27 (637 ヒット)

We will co-organize “Trends in Theory of Correlated Materials (TTCM 2018), Oct. 8-10 (2018), Geneva. Visit the site ! It's a continuation of successful bilateral workshops between Japan and Swiss.


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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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