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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 2017, 42 days left this year !
Recent News
Poster : hatsugai on 2017-10-06 16:36:02 (78 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.

Poster : hatsugai on 2017-08-17 17:01:30 (300 reads)

We have two opening positions for assistant professors (Hatsugai group). [Details]

Poster : hatsugai on 2017-08-17 17:00:09 (342 reads)

We are organizing a Japan-Swiss workshop TTCM2017 at EPOCHAL Tsukuba, Sep.10-13 (2017). Limited number of posters will be still accepted.

Poster : hatsugai on 2017-08-03 13:38:17 (265 reads)

A numerical scheme to calculate the many body Chern number for a ground state multiplet is formulated and explicitly given for projected bands of any lattice. We demonstrate its validity for lattice analogue of the nu=1/3 and 1/2 states. The string gauge to realize the minimum flux compatible with the periodicity of the unit cell is also presented. [arXiv:1707.06722]. The paper is published in JPSJ lett.

Poster : hatsugai on 2017-06-23 18:52:34 (327 reads)

Japanese article on topological phases, Sorry

    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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