Updated on 2025/04/11

写真a

 
MINAMI, Kazuhiko
 
Organization
Graduate School of Mathematics Division of Mathematics Advanced Topology Associate professor
Graduate School
Graduate School of Mathematics
Undergraduate School
School of Science
Title
Associate professor
Contact information
メールアドレス

Degree 1

  1. Ph.D ( 1993.3   The University of Tokyo ) 

Research Interests 3

  1. 物性基礎論

  2. 統計力学

  3. 数理物理

Research Areas 2

  1. Others / Others  / Statistical Physics

  2. Others / Others  / Mathematical Physics/Fundamental Theory of Physical Properties

Current Research Project and SDGs 1

  1. Study on solvable lattice models and related topics

Professional Memberships 1

  1. 日本物理学会

Committee Memberships 1

  1. 日本物理学会   領域11世話人  

    2004.4 - 2005.5   

 

Papers 33

  1. Conserved charges of series of solvable lattice models Open Access

    Minami, K

    NUCLEAR PHYSICS B   Vol. 1012   2025.3

  2. The Exact Susceptibility of the Spin-S Transverse Ising Chain with Next-nearest-neighbor Interactions

    Minami, K

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   Vol. 92 ( 5 )   2023.5

  3. Onsager algebra and algebraic generalization of Jordan-Wigner transformation

    Minami, K

    NUCLEAR PHYSICS B   Vol. 973   2021.12

     More details

  4. Geometric criterion for solvability of lattice spin systems

    Ogura, M; Imamura, Y; Kameyama, N; Minami, K; Sato, M

    PHYSICAL REVIEW B   Vol. 102 ( 24 )   2020.12

     More details

  5. Exact solution of a cluster model with next-nearest-neighbor interaction

    Yanagihara, Y; Minami, K

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   Vol. 2020 ( 11 )   2020.11

     More details

    Language:Japanese  

    DOI: 10.1093/ptep/ptaa146

    Web of Science

  6. Honeycomb lattice Kitaev model with Wen-Toric-code interactions, and anyon excitations

    Minami Kazuhiko

    NUCLEAR PHYSICS B   Vol. 939   page: 465 - 484   2019.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nuclphysb.2018.12.029

    Web of Science

  7. Infinite number of solvable generalizations of XY-chain, with cluster state, and with central charge c = m/2

    Minami Kazuhiko

    NUCLEAR PHYSICS B   Vol. 925   page: 144 - 160   2017.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nuclphysb.2017.10.004

    Web of Science

  8. Solvable Hamiltonians and fermionization transformations obtained from operators satisfying specific commutation relations, Reviewed

    Kazuhiko Minami

    J. Phys. Soc. Jpn.   Vol. 85   page: 024003   2016.12

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  9. Equivalence between the two-dimensional Ising model and the quantum XY chain with randomness and with open boundary. Reviewed

    Kazuhiko Minami

    Europhys. Lett.   Vol. 108   page: 30001   2014.10

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  10. Exact transverse susceptibility of one-dimensional random bond Ising model with alternating spin. Reviewed

    Kazuhiko Minami

    J. Phys. A: Math. Theor.   Vol. 46   page: 505005   2013.11

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  11. Fractal structure of a solvable lattice model Reviewed

    Kazuhiko Minami

    Int. J. Pure and Applied Math.   Vol. 59   page: 243-255   2010

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  12. Spin-1/2 Ising-Heisenberg model with the pair XYZ Heisenberg interaction and quartic Ising interactions as the exactly soluble zero-field eight-vertex model Reviewed

    Jozef Strecka, Lucia Canova and Kazuhiko Minami

    Phys.Rev.E   Vol. 79   page: 051103   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

    The spin-1/2 Ising-Heisenberg model with the pair XYZ Heisenberg interaction and quartic Ising interactions is exactly solved by establishing a precise mapping relationship with the corresponding zero-field (symmetric) eight-vertex model. It is shown that the Ising-Heisenberg model with the ferromagnetic Heisenberg interaction exhibits a striking critical behavior, which manifests itself through re-entrant phase transitions as well as continuously varying critical exponents. The changes in critical exponents are in accordance with the weak universality hypothesis in spite of a peculiar singular behavior that emerges at a quantum critical point of the infinite order, which occurs at the isotropic limit of the Heisenberg interaction. On the other hand, the Ising-Heisenberg model with the antiferromagnetic Heisenberg interaction surprisingly exhibits less significant changes in both critical temperatures and critical exponents upon varying the strength of the exchange anisotropy in the Heisenberg interaction.

  13. Weak universal critical behavior and quantum critical point of the exactly soluble spin-1/2 Ising-Heisenberg model with the pair XYZ Heisenberg and quartic Ising interactions Reviewed

    Jozef Strecka, Lucia Canova and Kazuhiko Minami

    AIP Conf. Proc.   Vol. 1198   page: 156-165   2009

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  14. *The free energies of six-vertex models and the n-equivalence relation Reviewed

    Kazuhiko Minami

    J.Math.Phys.   Vol. 49   page: 033514   2008

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    The free energies of six-vertex models on general domain D with various boundary conditions are investigated with the use of the n-equivalence relation which classifies the thermodynamic limit properties. It is derived that the free energy of the six-vertex model on the rectangle is unique in the limit in which both the height and the width goes to infinity. It is derived that the free energies of the model on D are classified through the densities of left/down arrows on the boundary. Specifically the free energy is identical to that obtained by Lieb and Sutherland with the cyclic boundary condition when the densities are both equal to 1/2. This fact explains several results already obtained through the transfer matrix calculations. The relation to the domino tiling (or dimer, or matching) problems is also noted.

  15. An equivalence relation of boundary/initial conditions and the infinite limit properties Reviewed

    J.Phys.Soc.Jpn.   Vol. 74   page: 1640   2005

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  16. Thermodynamic properties of a tetramer Ising-Heisenberg bond alternating chain as a model system for Cu(3-Chloropyridine)2(N3)2 (共著) Reviewed

    Phys.Rev. B   Vol. 72   page: 024459 (1-11)   2005

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  17. On the saturation field of magnets Reviewed

    J.Mag.Mag.Mat.   Vol. 270   page: 104   2004

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  18. Magnetic properties of a tetramer ferro-ferro-antiferro-antiferromagnetic Ising-Heisenberg bond alternating chain as a model systemfor Cu(3-Clpy)2(N3)2 (共著) Reviewed

    Czech.J.Phys.   Vol. 54 ( Suppl 4 ) page: 583   2004

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  19. Magnetization process of an S=1/2 tetramer chain withferromagnetic-ferrimagnetic-antiferromagnetic bond alternating interactions (共著) Reviewed

    J.Phys.Soc.Jpn.   Vol. 72   page: 943   2003

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  20. Thermodynamic properties of a quantum ferrimagnet formed byan S=1/2 tetramer chain (共著) Reviewed

    Prog.Theor.Phys.   Vol. 145   page: 150   2002

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  21. High-field magnetization of an s=1/2 F-F-AF-AF tetramer chain (共著) Reviewed

    Physica B   Vol. 294-295   page: 30   2001

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  22. Magnetization process of the S=1/2 and 1 ferrimagnetic chain and dimer (共著) Reviewed

    J.Phys.Soc.Jpn.   Vol. 68   page: 2214   1999

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  23. Magnetic properties of a quantum fervimagnet NiCu(pba)(H2O)32D2O(共著) Reviewed

    J.Phys.Soc.Jpn.   Vol. 67   page: 2209   1998

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  24. Experimental and theoretical approach to finite-size effects in an S=1/2 antifervromagnetic Heisenberg open chain(共著) Reviewed

    Phys.Rev. B   Vol. 57   page: 8285   1998

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  25. *The susceptibility in Arbitrary directions and the specific heat of general Ising-type chains with uniform, periodic and random structures Reviewed

    J.Phys.Soc.Jpn.   Vol. 67   page: 2255   1998

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  26. The zero-field susceptibility of the transverse Ising chain with arbitrary spin Reviewed

    J.Phys. A   Vol. 29   page: 6395   1996

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  27. Mognetic susceptibility of the S=3/2 finite linear-chain Heisenberg antiferromagnet CsV1-χMgχCl3(共著) Reviewed

    J.Phys.(Cond. Mat.)   Vol. 8   page: 8407   1996

     More details

    Language:English   Publishing type:Research paper (scientific journal)  

  28. *Non-universal critical behaviour of two-dimensional Ising systems (共著) Reviewed

    J.Phys. A   Vol. 27   page: 7301   1994

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  29. Non-universal critical behaviour of the two-dimensional Ising model with crossing bonds (共著) Reviewed

    Physica A   Vol. 192   page: 2152   1993

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  30. A two-dimensional Ising model with non-universal critical behaviour (共著) Reviewed

    Physica A   Vol. 195   page: 4457   1993

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  31. Non-universal critical behaviour of two-dimensional Ising models via two-body interactions (共著) Reviewed

    Phys. Lett. A   Vol. 180   page: 2179   1993

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  32. Coherent-anomaly method applied to the eight-vertex model (共著) Reviewed

    Physica A   Vol. 187   page: 2282   1992

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

  33. Multi-effective-field theory -applications to the CAM analysis of the two-dimensional Ising model- (共著) Reviewed

    Physica A   Vol. 174   page: 3479   1991

     More details

    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

▼display all

Books 4

  1. Lectures on Linear Algebra

    ( Role: Sole author)

    2020.1 

     More details

    Language:Japanese

  2. 格子模型の数理物理

    南 和彦( Role: Sole author)

    サイエンス社  2014.6 

     More details

    Total pages:155   Language:Japanese Book type:Scholarly book

  3. Lectures on Calculus

    ( Role: Sole author)

    2010.1 

     More details

    Language:Japanese

  4. Coherent-Anomary Method-Mean Field, Fluctuations and Systematics(共著)

    World Scietntific  1995 

     More details

    Language:English

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. フェルミオン化の新しい手法と非フェルミオン的厳密解の研究

    2025.4 - 2029.3

    科学研究費補助金  基盤研究(C)

      More details

    Authorship:Principal investigator 

  2. 新しい対角化の手法による量子系の厳密解の研究

    Grant number:19K03668  2019.4 - 2025.3

    科学研究費助成事業  基盤研究(C)

    南 和彦

      More details

    Authorship:Principal investigator 

    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    新しく見出された対角化の方法による、2次元量子スピン系の厳密解の研究である。ハミルトニアンの各項が条件をみたすとき、交換関係と周期のみから自由エネルギーが厳密に導かれることを、申請者が見出した。条件をみたす演算子列から解ける模型が得られ、解くための変換も同時に自動的に得られる。既知の主要な模型の多くが、この方法で同じ手順で対角化できている。この手法を基礎に以下のテーマを扱う:
    1) Kitaev模型を特殊な場合として含む2次元系の可解模型の系列
    2) この手法による新しい2次元量子系の厳密解
    3) 手法自体の拡張による可解模型の新しいクラス
    4) 等価性、CFT、量子計算に関連する磁性物質等への応用
    相互作用や外部磁場など、ハミルトニアンを構成する演算子がある種の代数構造を持つとき、それを free fermion系に変換して対角化できる。これが本研究課題の出発点となる手法である。この変換はJordan-Wigner変換の代数的な一般化とみなすことができる。この方法によって既に解かれている代表的な可解模型が対角化され、またJordan-Wigner変換では解けない模型も対角化される。またこの手法に現れる演算子から、2次元Ising模型の代数構造であるOnsager代数が生成される。
    量子多体系において、保存量はその可積分性にかかわるとともに、系の物理的な性質にも大きな影響を及ぼす。例えば孤立量子系の平衡化において、局所的な保存量が自由度と同程度の数だけ存在するとき、系は通常の平衡状態には行かず、保存量によって拘束された振る舞いを示す場合がある。
    以前、K.Minami, J.Phys.Soc.Jpn.(2016)で導入したfermion化の方法によってK.Minami, Nucl.Phys.B (2017)において加算個の可解模型を構成したが、そのそれぞれに対して加算個の保存量の存在を示し、その具体的な表式を得ることができた。
    そのうちtransverse Ising模型の場合にはM.Grady 1982、L.Doran and M.Grady 1982、T.Prosen 1998、Y.Chiba 2024によって求められた保存量を再現し、また別にOgura et al. 2021の保存量が現れ、またそれとは別のD.B.Uglov and I.T.Ivanov 1996によって得られた保存量も再現する。結果は投稿準備中である。
    2023年度の前半は、1次元量子系とそれに等価な2次元古典系の対角化について詳細な計算を実行した。この計算はまだ継続しているが、一方で保存量について短い論文を書こうと思って始めた仕事に、当初の予想よりも時間がかかっている。
    <BR>
    保存量を求める際には、交換関係の結果として得られる演算子をある種の樹形図を書いて分類するという直接的な方法がとられることが多いが、本研究ではHamiltonianとの交換関係の表現行列を一般的に書き下し、その固有値が0である固有空間の基底を求めることによって、可算個の模型に対して保存量を同時に書き下した。その結果は現在までに知られている結果を含み、さらに可算個の模型について新しい結果を与える。
    上記の可算個の1次元系について、すべての保存量を求められないかどうかを調べている。また同じ手法で扱うことができるいくつかの2次元系についても、同様にして保存量について議論できる可能性がある。特に量子情報などとの関連から興味を持たれている2次元の6角格子Kitaev模型は本研究課題の手法で基底状態を求めることができるので、保存量についてある程度は議論できることが予想される。

  3. 格子模型のフラクタル構造と平衡および非平衡系への展開

    2007

    科学研究費補助金  基盤研究(C)(一般),課題番号:19540400

    南 和彦

      More details

    Authorship:Principal investigator 

 

Teaching Experience (On-campus) 2

  1. Calculus I

    2011

  2. Calculus II

    2011

 

Social Contribution 1

  1. 数学アゴラ「数理と自然」

    Role(s):Lecturer

    名古屋大学大学院多元数理科学研究科  数学アゴラ  2024.8