Select Language
Number of visitors Since 2009
Today : 149
Yesterday : 220
This Month : 4400
Total : 1408389
Average : 543
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
Yasuhiro's photo
Conferences & Workshop
My google scholar page
TAG index
ResercherID: Y. Hatsugai
Main Menu

    We are back from the earthquake on March 17 (2011).     Welcome to our site.   flagflag

HATSUGAI   Lab.     Institute of Physics, University of Tsukuba

L: Topological stability of Dirac cones, merging & C: fractal in graphene (Flying Butterfly) & R: Non Abelian gauge structure in solids
Refereneces :
[1] Y. Hatsugai, T. Fukui, H. Aoki, Phys. Rev. B 74, 205414 (2006) : [Journal Link] , arXiv:cond-mat/0607669
"Topological analysis of the quantum Hall effect in graphene"
[2] Y. Hatsugai, J. Phys. Soc. Jpn. 73, 2604 (2004) : [Journal Link] , arXiv:cond-mat/0405551
"Explicit Gauge Fixing for Degenerate Multiplets: A Generic Setup for Topological Orders"

Hatsugai Group, Condensed Matter Theory

Targets of our research is to explore new insight and find novel physical principles in condensed matter materials and phenomena. We have been working on the following topics. [paper]

[1] Geometrical phases of condensed matter physics
Target material and phenomena
(1) Graphene as a relativistic Dirac particle in solid states
(2) Quantum Hall effects as typical topological insulators
(3) Quantum spin Hall phase as a time reversal invariant topological insulator
(4) Electrons with strong correlation as non trivial quantum liquids
(5) Exotic superconductivity with anisotropic pairing
(6) Frustrated magnets as typical spin liquids
(7) Semiconductor nano-structures as a playground of novel quantum phenomena
(8) Universal edge states in quantum (spin) Hall effects, Haldane magnets, photonic crystals and cold atoms
(9) Aharonov-Bohm effect and its generalization

Theoretical methods and concepts
(1) Non-Abelian gauge structures of the Berry connections
(2) Berry connections and their generalization
(3) Quantum order parameters by the Chern numbers and generic Berry phases
(4) Theory of generic Aharnov-Bohm effects
(5) Entanglement entropy of quantum liquids and spin liquids
(6) Universality of the Bulk-Edge correspondence
(7) Characterization of topological orders in quantum liquids

[2] Novel quantum phenomena in real material and their relation to the emerging mathematical concepts as quantum group
Some works [Link1][Link2]
[3] Novel techniques to study ferimonic many body systems with strong correlation
Basic work [Link]
[4] Realistic electronic structures & topological quantities
One of my basic works [Link]


Let me explain what we are interested in!
Class & Theses
Information about the courses & theses. Japanese only at a moment
Who we are!
Coming seminar
How to join us
Information to join us:

  • Graduate courses at Univ. of Tsukuba [Web]
  • Contact me before taking the exam !

Information for access. How to reach us.

Institute of Physics
University of Tsukuba
1-1-1 Tennodai
Ibaraki 305-8571

Mobile device User
Current time
Year 2013
A HAPPY NEW YEAR 2017, 345 days left this year !
Recent News
Poster : hatsugai on 2016-12-28 12:07:44 (18 reads)

We have extended the chiral symmetry to the case with tiled Dirac fermions on lattice. The paper has published in Phys. Rev. B 94, 235307 (2016)

Poster : hatsugai on 2016-12-12 13:50:23 (37 reads)

Koji Kudo got a poster prize at the workshop in Kobe 2016. Congratulation !

Poster : hatsugai on 2016-12-07 09:59:47 (58 reads)

Only in Japanese. Sorry [日本物理学会 会誌最新号目次] 日本物理学会会員の方はマイページよりご覧ください。

Poster : hatsugai on 2016-12-01 17:22:36 (72 reads)

Onlly in Japanese. Sorry

Poster : hatsugai on 2016-12-01 16:41:58 (106 reads)

1 OutreachChiba City museum of science, Y. Hatsugai,Dec.4 (2016)

2 OutreachChiba City museum of science, Y. Hatsugai,Dec.17 (2016)

    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)
    Article Category list
    recent update
    To Web articles's top
    Article archive