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初貝 安弘
筑波大学
理工学群副学群長
数理物質系物理学域
筑波大学大学院
数理物質科学研究科
物理学専攻 教授
学際物質科学研究センター(TIMS)教授
初貝写真
Yasuhiro-Nov11-2009
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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. 新年あけましておめでとうございます。今年もあと98日!
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投稿者 : hatsugai 投稿日時: 2016-09-16 10:55:24 (33 ヒット)

Our paper on a photonic system in 3D which has the Weyl points due to breaking inversion is published in Phys. Rev. B as an edtors' suggestsion. See also highlights. The Weyl points are characterized as the topopoligical critial points of the sliced 2D system which has a non trivial Chern number (section Chern number) with jumps. Momentum selective edge states propagating near the boundaries are discussed as a typical example of the bulk-edge correspondence. Have a look at !


投稿者 : hatsugai 投稿日時: 2016-05-12 09:29:05 (335 ヒット)

We are organizing a workshop on the bulk-edge correspondence in relation to cold atoms and ARPES ( theories as well) as a YITP workshop ( Yukawa Institute of theoretical physics) in Kyoto Sep.27-30, 2016. Its registration will be open soon. Stay tuned. [YITP site] . [Direct link].


投稿者 : hatsugai 投稿日時: 2016-01-16 17:16:48 (294 ヒット)

Topological pump, proposal by Thouless and just recently realized experimeatally in Kyoto and Munich independently, is revisited from the bulk-edge correspondence (BEC). It's typically described by well known Harper equation as in QHE but the view point of BEC supplies quite different physical / mathematical structure. Pumped charge is carried by bulk but its quantization is guaranteed by the topological number defined by a singular motion of the center of mass caused by edge states. However this singular motion can not be observed in reality by a pumping of finite speed.The edge states are hidden! Counting the topological number by singularities of the spectral flow is a standard technique in the discussion of the Atiyah-Patodii-Singer index theorem. The same counting appears in the BEC in the pumping. It's a unexpected surprise. Have a look at arXiv:1601.03537, Phys. Rev. B94, 041102(R) (2016)


    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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