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ResercherID: Y.Hatsugai
投稿者 : hatsugai 投稿日時: 2012-03-15 08:44:43 (2712 ヒット)

 Our visiting professor Yshai Avishai is telling us about his recent research on March 15, 2012 (15:00 -17:00). The title of the talk is "Electron in the field of magnetic charge : Tight binding solution and mapping on a realistic physical system". It is understandable for students. Please feel free and come. The detail is here. Contact :Y. Hatsugai.

投稿者 : hatsugai 投稿日時: 2012-02-25 18:00:26 (2877 ヒット)

 We have a distinguished visiting professor Yshai Avishai from Ben Grion University (Israel) staying with us from Feb.12 (2012) to March 31 (2012). He is the APS fellow and also working as one of the regional editors of the Physical Review Letters. 

投稿者 : hatsugai 投稿日時: 2010-07-06 17:30:25 (3259 ヒット)

7月13日(火)D410にて16:00より東大物工の宇田川将文さんに最近のご研究である電荷アイス系の厳密解、量子相転移他に関してのセミナーをお願いすることとなりました。ご関心のある方のご参加をお待ち致しております。M. Udagawa, H. Ishizuka, and Y. Motome, Phys. Rev. Lett. 104, 226405 (2010)  [詳細]  [poster]

投稿者 : hatsugai 投稿日時: 2010-05-31 11:20:27 (4161 ヒット)

5月27日(木)15:00から筑波大学自然系学系棟のD312にて現在東京大学物性研究所に滞在されている Giovanni Vignale 先生に"Many-body effects on the optical and magnetic properties of doped graphene sheets"と題してグラフェンに関する多体効果のお話をしていただくこととなりました。ご関連の皆さまは是非足をお運びください。 [要旨他] [ポスター]

投稿者 : hatsugai 投稿日時: 2009-11-16 19:00:39 (5722 ヒット)


2009年11月27日筑波大学第一エリア自然学系棟B棟1階B119:プログラム [pdf]
・場所等に関しましては以下のリンクをご参考にしてください。自然系棟B棟一階です。筑波大学...自然系棟B棟に関しては以下のリンクに詳細がございます。 [地図その他]

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4 (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208日!
投稿者 : hatsugai 投稿日時: 2020-03-15 00:55:42 (190 ヒット)

Topological phases are everywhere. Higher order topological phases are realized in a spring mass model on a Kagome lattice. Berry phases quantized in a unit of 2π/3 predict localized vibration modes near the corner of the system. This quantization is due to a symmetry protection. Have a look at our paper in Physical Review B. Most of the topological phenomena are realized in a mechanical analogue, which are much accessible without any real high-tech. Of course, it is still a non-trivial task.

投稿者 : hatsugai 投稿日時: 2020-02-26 09:17:33 (293 ヒット)

Pierre Delplace (Laboratoire de Physique, École Normale Supérieure de Lyon, France) will be telling us on his series of works as a title "Topological waves from condensed matter to the atmosphere". Audience from various area is welcome such as physics and geophysics. The talk is from 14:00 Feb. 27 (2020) at B118. See details in pdf. Join us.

投稿者 : hatsugai 投稿日時: 2020-01-15 01:17:36 (447 ヒット)

ZQ Berry phase, that is quantized due to symmetry, is defined and used successfully for characterization of 2D/3D higher order topological phases with/without interaction. Both for spins and fermions. The article by Hiromu Araki, Tomonari Mizoguchi and Yasuhiro Hatsugai has been published in Physical Review Research. Also it is highlighted here as one of the Rapid Communications. Have a look at !

投稿者 : hatsugai 投稿日時: 2019-12-06 18:21:14 (352 ヒット)

On Dec. 18, 2019, Yuichi Otsuka (RIKEN) will tell us on their work of the quantum Monte Carlo study for interacting Dirac fermions on lattice. As is known, the Dirac fermions are mother of all topological phases. " QMC Study of quantum criticality in 2D interacting Dirac fermions.". The talk will be given in Japanese.

投稿者 : hatsugai 投稿日時: 2019-12-03 01:35:51 (533 ヒット)

On Dec. 11 (Wed), K. Kawaguchi (RIKEN) will tell us on their work by a title "Collective cell dynamics and topology". It's a new area for us. Join the seminar. The talk will be given in Japanese.

    [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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