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Research on ground states of quantum spin systems

Research Project

Project/Area Number 16K05171
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Basic analysis
Research InstitutionThe University of Tokyo

Principal Investigator

Ogata Yoshiko  東京大学, 大学院数理科学研究科, 教授 (80507955)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsSPT相 / 量子スピン系 / 基底状態 / 基底状態の分類
Outline of Final Research Achievements

We introduced indices of SPT(symmetry protected topological) of quantum spin chains, for on-site and reflection symmetries. We proved rigorously that the indices are invariant of the classification of SPT phases.It is still open if it is a complete invariant, but we showed that it is a complete invariant of some related classification of states.
We also showed automorphic equivalence, an important tool for such analysis, for infinite systems.

Academic Significance and Societal Importance of the Research Achievements

SPT 相という物理相の分類問題が近年注目されている.これは、何らかの決められた対称性を持ち、ハミルトニアンのスペクトルにギャップを持つような系の分類問題である.スペクトルギャップのあるモデルというのはある意味正規な状態を見ることができるため, 二つのモデルが同値というのは,それらが臨界現象を経験することなく移り合うことができるということで,物理的に自然な分類問題となっておりその数学的研究は学術的に意義深い.また,量子コンピューターを実現する系として,実用上も注目を集める課題である.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 1 results,  Acknowledgement Compliant: 3 results) Presentation (8 results) (of which Int'l Joint Research: 8 results,  Invited: 8 results)

  • [Journal Article] Automorphic equivalence within gapped phases in the bulk2020

    • Author(s)
      Moon Alvin、Ogata Yoshiko
    • Journal Title

      Journal of Functional Analysis

      Volume: 278 Issue: 8 Pages: 108422-108422

    • DOI

      10.1016/j.jfa.2019.108422

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Perturbation Theory of KMS States2019

    • Author(s)
      Ejima S.、Ogata Y.
    • Journal Title

      Annales Henri Poincare

      Volume: 20 Issue: 9 Pages: 2971-2986

    • DOI

      10.1007/s00023-019-00824-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Lieb Schultz Mattis Type Theorems for Quantum Spin Chains Without Continuous Symmetry2019

    • Author(s)
      Ogata Tasaki
    • Journal Title

      Communications in Mathematical Physics

      Volume: 1432-0916 Issue: 3 Pages: 1-12

    • DOI

      10.1007/s00220-019-03343-5

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Z_2-Index of Symmetry Protected Topological Phases with Time Reversal Symmetry for Quantum Spin Chains2019

    • Author(s)
      Ogata Yoshiko
    • Journal Title

      Communications in Mathematical Physics

      Volume: 374 Issue: 2 Pages: 705-734

    • DOI

      10.1007/s00220-019-03521-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A class of asymmetric gapped Hamiltonians on quantum spin chains and its characterization III2017

    • Author(s)
      Yoshiko Ogata
    • Journal Title

      Comm. Math. Phys

      Volume: 352 Pages: 1205-1263

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] A class of asymmetric gapped Hamiltonians on quantum spin chains and its characterization III2017

    • Author(s)
      Yoshiko Ogata
    • Journal Title

      Comm. Math.Phys.

      Volume: 352 Issue: 3 Pages: 1205-1263

    • DOI

      10.1007/s00220-016-2810-9

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] A class of asymmetric gapped Hamiltonians on quantum spin chains and its characterization I2016

    • Author(s)
      Yoshiko Ogata
    • Journal Title

      Comm. Math.Phys.

      Volume: 348 Issue: 3 Pages: 1011-1042

    • DOI

      10.1007/s00220-016-2696-6

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] A class of asymmetric gapped Hamiltonians on quantum spin chains and its characterization II2016

    • Author(s)
      Yoshiko Ogata
    • Journal Title

      Comm. Math.Phys.

      Volume: 348 Issue: 3 Pages: 847-895

    • DOI

      10.1007/s00220-016-2697-5

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] A classification of pure states on quantum spin chains satisfying the split property with on-site finite group symmetries2019

    • Author(s)
      Yoshiko Ogata
    • Organizer
      Oberwolfach Workshop ID 1944 Subfactors and Applications
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Classification of symmetry protected topological phases in quantum spin chains2019

    • Author(s)
      Yoshiko Ogata
    • Organizer
      Rigorous statistical mechanics and related topics RIMS
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Automorphic equivalence within gapped phases in the bulk2019

    • Author(s)
      Yoshiko Ogata
    • Organizer
      East Asian Core Doctoral Forum on Mathematics
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Classification of symmetry protected topological phases in quantum spin chains2019

    • Author(s)
      Yoshiko Ogata
    • Organizer
      Thematic program Quantum Information. Madrid
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Classification of SPT phases in quantum spin chains2019

    • Author(s)
      Yoshiko Ogata
    • Organizer
      Oberwolfach Workshop ID 1937 Many-Body Quantum Systems
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A class of asymmetric gapped Hamiltonians on quantum spin chains and its characterization III2017

    • Author(s)
      Yoshiko Ogata
    • Organizer
      Operator algebras and Quantum Information Theory
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A class of asymmetric gapped Hamiltonians on quantum spin chainsand its characterization2016

    • Author(s)
      Yoshiko Ogata
    • Organizer
      QMath13
    • Place of Presentation
      アトランタ
    • Year and Date
      2016-10-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Classification of gapped Hamiltonians in quantum spin chains2016

    • Author(s)
      Yoshiko Ogata
    • Organizer
      MSJ-SI Operator Algebras and Mathematical Physics
    • Place of Presentation
      仙台
    • Year and Date
      2016-08-01
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2016-04-21   Modified: 2021-02-19  

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