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初貝 安弘
物理学専攻 教授,物理学専攻長
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ResercherID: Y. Hatsugai
投稿者 : hatsugai 投稿日時: 2015-03-09 11:42:24 (789 ヒット)

The paper "Disentangled topological numbers by a purification of entangled mixed states for non-interacting fermion systems" by Takahiro Fukui and YH is now published in J. Phys. Soc. Jpn. 74, 1674 (2015), also on the net arXiv:1501.07031

投稿者 : hatsugai 投稿日時: 2015-02-25 10:54:05 (1093 ヒット)

Flat bands in Weaire-Thorpe model and silicene is discussed and the paper is now published in New J. Phys. as a special issue article for silicene.. Electronic structure of silicene is algebraically described which is qualitatively consistent with the first principle results. Silicene is not a simple generalization of graphene but is featured by the multi-orbital character. Generic arguments for the flat band we have proposed before is nicely applied. [arXiv:1410.7885]

投稿者 : hatsugai 投稿日時: 2015-02-19 00:54:08 (1066 ヒット)

Massive/massless Dirac cones with/without tilting for 2D semiconductors are described and now the paper has been published in Phys. Rev.B. 4D notations are used for compact derivations of the Landau levels of Dirac cones, extended chiral symmetry and generalized Aharonov-Casher type shifted zero modes. [arXiv:1410.6250] This is a kind of general description of the narrow gap semiconductor as the gapped Dirac cones with tilting. I am sure it can be useful.

投稿者 : hatsugai 投稿日時: 2014-08-19 13:29:55 (805 ヒット)

Takahiro Fukui and I have put a new paper "Entanglement Chern number for an extensive partition of a topological ground state" on the net. It can be a useful tool for several topological phases where conventional Chern numbers are trivial due to some symmetrical constraints. [arXiv]

投稿者 : hatsugai 投稿日時: 2014-08-06 13:13:14 (1059 ヒット)

Our recent paper with Toshikaze Kariyado is accepted for publication in Phys. Rev. B where the bulk-edge correspondence is discussed with the Berry connections and adiabatic continuation. As an example, lattice Dirac fermions with 1/4 filling are described with several types of edges where quantized Berry phases in unit of pi/2 is useful. Have a look at [arXiv:1404.4451]

投稿者 : hatsugai 投稿日時: 2014-07-08 18:35:51 (1002 ヒット)

Now our paper is published in Phys. Rev. B. It is also on the net arXiv:1403.1648, "Polarization as a topological quantum number in graphene" with Hideo Aok. In the article, one more topological invariant for the Hofstadter problem and graphene is described. Have a look at.

投稿者 : hatsugai 投稿日時: 2014-05-22 13:41:08 (908 ヒット)

第35回 数理の翼 夏季セミナー で8月に話をします。皆さんmotivationが高そうなので楽しみにしています。[概要]

投稿者 : hatsugai 投稿日時: 2014-05-22 13:18:02 (979 ヒット)

We have discussed weak topological phases with super structures using Berry phases. Have a look at our paper with Y.Yoshimura, K.-I. Imura and T. Fukui [arXiv ].

投稿者 : hatsugai 投稿日時: 2014-02-08 11:45:15 (1107 ヒット)

大学、大学院での物理学に興味がある方向けの「物理学ガイダンス」(日本評論社)に熱力学に関する小文を書きました。新入生でないかたもどうぞ。[日本評論社] [アマゾン]

投稿者 : hatsugai 投稿日時: 2014-02-03 14:47:48 (860 ヒット)

Physics of graphene の第7章にグラフェンに関するトポロジカルな側面について少し詳しい議論をまとめました。(青木秀夫先生と共著)図書館等でご覧いただければ幸いです。[アマゾン ] で中身が一部ですが、読めます。

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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30年の新年あけましておめでとうございます。今年もあと225日!
投稿者 : hatsugai 投稿日時: 2018-05-08 12:09:09 (86 ヒット)

Atsuo Shitade (RIKEN, CEMS) will give a talk on May 30 (2018) with a title "Theory of Orbital Magnetic Quadrupole Moment and Magnetoelectric Susceptibility". The detail is here.

投稿者 : hatsugai 投稿日時: 2018-04-20 18:51:10 (83 ヒット)

ありがとうございました: 平成30年度科学技術分野の文部科学大臣表彰,科学技術賞(研究部門)初貝安弘「トポロジカル相でのバルクエッジ対応の研究」 [PDF]

投稿者 : hatsugai 投稿日時: 2017-12-26 01:33:43 (366 ヒット)

最近の研究成果トピックスとして2017年度の科研費ニュース vol.3 にトポロジカル相とバルク・エッジ対応の関係の解説を我々の研究の背景として書きました。予備知識は不要ですのでご興味のある方はご覧下さい。「トポロジカル物質におけるバルク・エッジ対応」

投稿者 : hatsugai 投稿日時: 2017-12-22 19:52:51 (324 ヒット)

Michel Fruchart (Instituut-Lorentz Universiteit, Leiden) will give a talk on Jan.9 (2018), 10:30 am at Rm. B602 by the title Topology of effective evolutions: oriented scattering networks and the phase rotation symmetry

投稿者 : hatsugai 投稿日時: 2017-12-22 11:33:02 (328 ヒット)

Christopher Mudry (Paul Scherrer Institute, Switzerland) gives a talk by the title "Abelian topological order in three-dimensional space" at Rm. B602 from 14:00 on Dec.28, (2017). The detail is here

    [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]
    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
    [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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