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初貝 安弘 ORCID iD icon
物理学専攻 教授
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科研費基盤研究S (17H06138) 第1回スタートアップ研究会 
平成29年6月25日(日)筑波大学東京キャンパス文京校舎 120講義室(講演),122講義室(ポスター)


午前:セッション1 (座長:福井)
8:30-9:10 初貝 安弘 (筑波大学)
9:10-9:50 木村 昭夫 (広島大学)
9:50-10:30 岩本 敏 (東京大学)

10:30-11:30 ポスター(AM)

午前:セッション2 (座長:河原林)
11:30-11:55 高橋 義朗 (京都大学)
11:55-12:20 小野 滉貴 (京都大学)
「1S0-3P0状態の冷却Yb原子を用いた研究 -トポロジカル物理の量子シミュレーションに向けて-」
12:20-12:45 素川 靖司 (JST・京都大学)

12:45-13:40 昼食

午後:セッション1 (座長:高橋)
13:40-14:10 古田 幹雄 (東京大学)
14:10-14:40 林 晋 (産総研・東北大学オープンイノベーションラボ)
14:40-15:10 井村 健一郎 (広島大学)
15:10-15:40 福井 隆裕 (茨城大学)
「Topological magneto-electric pump in three dimensions」

15:40-16:40 ポスター(PM)

午後:セッション2 (座長:木村)
16:40-17:10 青木 秀夫 (東京大学)
17:10-17:40 河原林 透 (東邦大学)
17:40-18:10 久野 義人 (京都大学)
18:10-18:15 初貝 安弘(筑波大学)

P. 1(AM) 小林 淳 (京都大学)
P. 2(PM) 中島 秀太 (京都大学)
「Topological Thouless pumping of ultracold atoms in optical lattices」
P. 3(AM) 苅宿 俊風 (物質材料機構)
「Band singularity by competition between band inversion and spin-orbit coupling」
P. 4(PM) 高橋 駿 (京都工芸繊維大学)
「Optical Weyl Points below the Light Line in Semiconductor Chiral Woodpile Photonic Crystals」
P. 5(AM) 金 仁基 (東京大学)
「Observation of Topological Interface State of Elastic Wave in 1D Phononic Crystal」
P. 6(PM) 角田 一樹 (広島大学)
P. 7(AM) 吉川 智己 (広島大学)
P. 8(PM) 大野 修平 (筑波大学)
「Photonic band of rotationally-stacked woodpile structure and deformation」
P.9(AM) 工藤 耕司 (筑波大学)
「Projected electron-electron Interaction of Landau-Hofstadter Bands on Several Lattices」
P.10(PM) 吉村 幸徳 (産総研・東北大学)
「Transport properties of disordered topological quantum pumping: from the view point of bulk-edge correspondence」
P.11(AM) 荒木 広夢 (筑波大学)
「Structure of entanglement Hamiltonians for models of 3D topological insulators」
P.12(PM) 平坂 真央 (東邦大学)
P. 13(AM) 藤澤 周平 (東邦大学)
科研費基盤A第4回研究会 March 2016
Talk files (partly password protected)
科研費基盤S第1回スタートアップ研究会 June 25 2017 写真

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178日!
投稿者 : hatsugai 投稿日時: 2020-06-18 07:34:20 (69 ヒット)

Linear electric circuits are one more non-quantum platform of the topological phenomena such as bulk-edge correspondence we have been working around. Then its non-hermitian extension with/without symmetry is surely of the important targets. We have here discussed mirror skin effects of the non-hermitian electric circuit where the boundary states dominate on the mirror symmetric lines. Also possible realization is proposed. Have a look at "Mirror skin effect and its electric circuit simulation" by Tsuneya Yoshida, Tomonari Mizoguchi, and Yasuhiro Hatsugai, Phys. Rev. Research 2, 022062(R) (2020) (Open access).

投稿者 : hatsugai 投稿日時: 2020-06-09 12:11:19 (88 ヒット)

We have been proposing a systematic construction scheme of flat bands by molecular orbitals (MO). Now it is extended for systems with non trivial topology where non trivial bands with non zero Chern numer may cross the flat bands although the Chern number of the flat band itself is vanishing. We have presented a various other examples such as the Haldane model and the Kane-Mele model of the MOs'. Have a look at Systematic construction of topological flat-band models by molecular-orbital representation" by Tomonari Mizoguchi and Yasuhiro Hatsugai, Phys. Rev. B 101, 235125 (2020) also arXiv:2001.10255.

投稿者 : hatsugai 投稿日時: 2020-03-15 00:55:42 (270 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 (401 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 (519 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 !

    [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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