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Who am I ?
Yasuhiro Hatsugai
Associate Provost (School of Science and Engineering)

Professor of Physics
Division of Physics
Faculty of Pure and Applied Sciences
TIMS Member
University of Tsukuba
1-1-1 Tennodai, Tsukuba
Ibaraki 305-8571 JAPAN
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"Physics of the bulk-edge correspondence :its diversity and universality"
Focused lectures at the Chiba University, organized by Prof. T. Nakayama
2015. July8-9
Content of the lectures (pdf files are mostly in English)
1. Introduction: [Talk file pdf]
2. Quantum Hall effects: [Talk file pdf]
♫ Gauge invariance and Laughlin argument: [Detail pdf]
3. Electronic structue of silicene: [Talk file pdf]
4. Berry phases & Chern number (their quantization): [Talk file pdf]
5. Symmetry protection for topological phases: [Talk file pdf]
6. Bulk-edge correspondence: [Talk file pdf]
Physics of bulk-edge correspondence: Focus lecture at Hiroshima Univ. June 27-29 (2012)
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Focus lecture

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Year 2013
A HAPPY NEW YEAR 2018, 350 days left this year !
Recent News
Poster : hatsugai on 2017-12-26 01:33:43 (65 reads)

Poster : hatsugai on 2017-12-22 19:52:51 (47 reads)

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

Poster : hatsugai on 2017-12-22 11:33:02 (43 reads)

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

Poster : hatsugai on 2017-11-27 18:03:29 (181 reads)

We are organizing an "International workshop : Variety and universality of bulk-edge correspondence 2018 (BEC2018) . Please do not confuse with Bose-Einstein condensation :) Its program is ready.

Poster : hatsugai on 2017-10-06 16:36:02 (130 reads)

The entanglement Chern numbers is a Chern number of an entanglement Hamiltonian which characterizes topological properties of a topological phase. Starting from a pure state density matrix of the ground state, one may obtain finite temperature (mixed state) density matrix by tracing out parts of the system. If the entanglement hamiltonian has a finite energy gap, the Chern number is well defined by lowering the temperature. We apply the concept for the 3D topological phases.The parity of the number of the Weyl point gives a well defined topological number to distinguish the the state is topologically non trivial. Have a look at arXiv 1708.03722 . The paper has been accepted for publication in Physical Review B.

    Bulk-edge correspondence
    [0] バルクとエッジ
    [1] Focus lecture
    [2] Original papers
    [3] Japanese Physical Society monthly issue Commentary (Only Japanese except abstract) [pdf]
    [4] "Band gap, dangling bond and spin : a physicist's viewpoint" [pdf]
    Topological phases
    [0]Historical project
    KAKEN-HI DB FY1992 : Topological effects in electronic/spin systems
    KAKEN-HI DB FY1994 : Topology & geometrical phases in condensed matter physics
    Some of my talk files
    [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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