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発行日時 パイプ名 見出し
2019-12-6 18:21 ニュース ニュースへの外部リンク BEC Seminar by Yuichi Otsuka +
2019-12-6 12:27 研究室 研究室への外部リンク Y. Otsuka (RIKEN), Dec. 18 (2019)
2019-12-6 12:26 研究室 研究室への外部リンク K. Kawaguchi, (RIKEN), Dec. 11 (2019)
2019-12-4 18:55 研究室 研究室への外部リンク [F] Referee of the Habilitations à diriger des recherches (HDR) at ENS de Lyon, at Nov. 25 (2019)
2019-12-3 1:35 ニュース ニュースへの外部リンク BEC Seminar by K. Kawaguchi +
2019-11-18 18:54 ニュース ニュースへの外部リンク Non hermitian FQH +
2019-11-14 1:28 ニュース ニュースへの外部リンク HOTI in COF (Covalent Organic Frameworks) +
2019-11-9 7:50 ニュース ニュースへの外部リンク HOTMI and symmetry protected spin Berry phases +
2019-11-6 18:14 研究室 研究室への外部リンク [F]JSPS/EPSRC/CNRS Core 2 core seminar at Tohoku Univ. Nov. 21-22 (2019)
2019-11-6 13:33 研究室 研究室への外部リンク [F] Hokkaido Univ. Jan. 27 (2020)
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25日!
投稿者 : hatsugai 投稿日時: 2019-12-06 18:21:14 (9 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 (70 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.

投稿者 : hatsugai 投稿日時: 2019-11-18 18:54:05 (81 ヒット)

We have discussed a non-hermitian version of the fractional quantum Hall states. The paper, by Tsuneya Yoshida, Koji Kudo and Yasuhiro Hatsugai, has been published in Scientific Reports ( also arXiv:1907.07596 ). Non-hermitian physics has been extended to the topologically ordered states. It's a try. Relevant situations can be realized in cold atom experiments.

投稿者 : hatsugai 投稿日時: 2019-11-14 01:28:29 (114 ヒット)

Covalent Organic Frameworks (COF), I understand, is a large molecule where many (block) organic molecules are linked by strong covalent bonds in a periodic or non-periodic manner. It is a nice place where the higher order topological insulating phase is realized as we have pointed out. Then if the COF has boundaries, one can naturally expect edge states/corner states associated with the symmetry protected Berry phases of the bulk. This is correct. One of such a COF, we discussed, is a polymerized triptycene on a decorated star lattice. Our paper ”Flat bands and higher-order topology in polymerized triptycene: Tight-binding analysis on decorated star lattices” by Tomonari Mizoguchi, Mina Maruyama, Susumu Okada, Yasuhiro Hatsugai is for the phenomena and has been published in Physical Review Materials (See also arXiv 1907.06088).

投稿者 : hatsugai 投稿日時: 2019-11-09 07:50:55 (240 ヒット)

We have proposed a new correlated topological phase, "higher-order topological Mott insulator (HOTMI)" where spin-charge separated corner states emerge that are protected by Z3 spin Berry phases of the bulk. It is a generalized bulk-edge correspondence. The article has been published in Phys. Rev. Lett. (also arXiv:1905.03484). Have a look at.

    [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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