磁気多極子秩序相及びスピ液体相の理論的特徴付けと実験検出方法の提案

2011 年度 研究成果報告書

• 研究課題/領域番号: 21740295
• 研究種目: 若手研究(B)
• 配分区分: 補助金
• 研究分野: 数理物理・物性基礎
• 研究機関: 青山学院大学 (2010-2011); 独立行政法人理化学研究所 (2009)
• 研究代表者: 佐藤 正寛 青山学院大学, 理工学部, 助教 (90425570)
• 研究期間 (年度): 2009 – 2011
• キーワード: 物性基礎論

研究概要

研究課題の目標は「多極子秩序のような複数演算子の積で定義される秩序やスピン液体などの検出しにくい多体状態をいかに特徴付けするか」「このような検出しにくい新しい状態がどのような系で実現するか」という問いに解答を与えることであった。研究代表者は、磁性体と冷却原子系を対象として、この問いについて理論研究を遂行した。特に磁気フラストレーションをもつJ1-J2スピン1/2鎖模型についての成果が中心的結果である。この模型に現れるベクトルカイラル秩序、ダイマー秩序などの多様な相構造を明らかにし、また磁場中で実現する磁気多極子液体相を特徴づける現実的実験手段として、核磁気共鳴の緩和率の温度磁場依存性と中性子散乱スペクトルのピーク位置の磁場依存性の測定が有効であることを明らかにした。

研究成果

• [雑誌論文] Spin-chirality separation and S3-symmetry breakings in the magnetization plateau of the quantum spin tube (2012)
  • 著者名/発表者名: Kouichi Okunishi, Masahiro Sato, Toru Sakai, Kiyomi Okamoto, and Chigak. Itoi
  • 雑誌名: Phys. Rev. B 巻: 85 ページ: 054416
  • DOI: DOI:10.1103/PhysRevB.85.054416
  • 査読あり
• [雑誌論文] Competing phases in spin-1/2 J_1-J_2chain with easy-plane anisotropy (2011)
  • 著者名/発表者名: Masahiro Sato, Shunsuke Furukawa, Shigeki Onoda, and Akira Furusaki
  • 雑誌名: Mod. Phys. Lett. B 巻: 25 ページ: 901
  • DOI: DOI:10.1142/S0217984911026607
  • 査読あり
• [雑誌論文] Chiral Order and Electromagnetic Dynamics in One-Dimensional Multiferroic Cuprates (2010)
  • 著者名/発表者名: Shunsuke Furukawa, Masahiro Sato, and Shigeki Onoda
  • 雑誌名: Phys. Rev. Lett 巻: 105 ページ: 257205
  • DOI: DOI:10.1103/PhysRevLett.105.257205
  • 査読あり
• [雑誌論文] Field and temperature dependence of the NMR relaxation rate in the magnetic quadrupolar liquid phase of spin-1/2 frustrated ferromagnetic chains (2010)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, and Tsutomu Momoi
  • 雑誌名: Phys. Rev. B 巻: 83 ページ: 064405
  • DOI: DOI:10.1103/PhysRevB.83.064405
  • 査読あり
• [雑誌論文] Coefficients of bosonized dimer operators in spin-1/2 XXZ chains and their applications (2010)
  • 著者名/発表者名: Shintaro Takayoshi and Masahiro Sato
  • 雑誌名: Phys. Rev. B 巻: 82 ページ: 214420
  • DOI: DOI:10.1103/PhysRevB.82.214420
  • 査読あり
• [雑誌論文] Quantum spin nanotubes-frustration, competing orders and criticalities (2010)
  • 著者名/発表者名: Toru Sakai, Masahiro Sato, Kouichi Okunishi, Kiyomi Okamoto, Chigak Itoi
  • 雑誌名: J. Phys.: Condens. Matter 巻: 22 ページ: 403201
  • DOI: DOI:10.1088/0953-8984/22/40/403201
  • 査読あり
• [雑誌論文] Unconventional Neel and dimer orders in a spin-1/2 frustrated ferromagnetic chain with easy-plane anisotropy (2010)
  • 著者名/発表者名: Shunsuke Furukawa, Masahiro Sato, and Akira Furusaki
  • 雑誌名: Phys. Rev. B 巻: 81 ページ: 094430
  • DOI: DOI:10.1103/PhysRevB.81.094430
  • 査読あり
• [雑誌論文] Spontaneous population imbalance in two-component Bose and Fermigases (2010)
  • 著者名/発表者名: Shintaro Takayoshi, Masahiro Sato and Shunsuke Furukawa
  • 雑誌名: Phys. Rev. A 巻: 81 ページ: 053606
  • DOI: DOI:10.1103/PhysRevA.81.053606
  • 査読あり
• [雑誌論文] Theory of the Optical Conductivity of Spin Liquid States in One-Dimensional Mott Insulators (2009)
  • 著者名/発表者名: Hosho Katsura, Masahiro Sato, Takashi Furuta, Naoto Nagaosa
  • 雑誌名: Phys. Rev. Lett 巻: 103 ページ: 177402
  • DOI: DOI:10.1103/PhysRevLett.103.177402
  • 査読あり
• [学会発表] Edge state and its stability of 2D antiferromagnetic quantum spin systems (2012)
  • 著者名/発表者名: Takafumi Suzuki and Masahiro Sato
  • 学会等名: APSMarch Meeting
  • 発表場所: Boston Convention Center, Boston, USA
  • 年月日: 2012-02-29
• [学会発表] Competition between SpinNematic and Spin Density Wave Orders inSpatially Anisotropic Frustrated Magnets in Magnetic Fields (2012)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara and Tsutomu Momoi
  • 学会等名: APS March Meeting
  • 発表場所: Boston Convention Center, Boston, USA
  • 年月日: 2012-02-28
• [学会発表] New phases induced by four-spin interaction in stacked triangular-lattice antiferromagnets in magnetic field (2011)
  • 著者名/発表者名: Shintaro Takayoshi and Masahiro Sato
  • 学会等名: Novel Quantum States in Condensed Matter 2011(NQS2011)
  • 発表場所: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto
  • 年月日: 2011-11-14
• [学会発表] Edge states and their stability of 2D antiferromagnets Edge states and their stability of 2D antiferromagnets (2011)
  • 著者名/発表者名: Takafumi Suzuki and Masahiro Sato
  • 学会等名: Novel Quantum States in Condensed Matter 2011(NQS2011)
  • 発表場所: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto
  • 年月日: 2011-11-14
• [学会発表] Theory for Raman scatteringin 1D spin-1/2 antiferromagnets : Effects of frustration and perturbations on the Heisenberg model (2011)
  • 著者名/発表者名: Masahiro Sato
  • 学会等名: Novel Quantum States in Condensed Matter 2011(NQS2011)
  • 発表場所: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto
  • 年月日: 2011-11-14
• [学会発表] Effect of Four-Spin Interactions on Phase Diagram of Classical Heisenberg Antiferromagnets on Stacked Triangular Lattice Under Magnetic Field (2011)
  • 著者名/発表者名: Shintaro Takayoshi and Masahiro Sato
  • 学会等名: SCES2011
  • 発表場所: University of Cambridge, Cambridge, UK
  • 年月日: 2011-08-02
• [学会発表] Theory of Raman Scattering Spectrum for One-Dimensional Quantum Magnets (2011)
  • 著者名/発表者名: Masahiro Sato, Hosho Katsura and Naoto Nagaosa
  • 学会等名: SCES2011
  • 発表場所: University of Cambridge, Cambridge, UK
  • 年月日: 2011-08-02
• [学会発表] Phase Diagram of Classical Heisenberg Antiferromagnets with Four-Spin Interactions on Stacked Triangular Lattice under Magnetic field (2011)
  • 著者名/発表者名: Shintaro Takayoshi and Masahiro Sato
  • 学会等名: APS March Meeting
  • 発表場所: Dallas, USA
  • 年月日: 2011-03-23
• [学会発表] Theory of Raman Scattering in One-dimensional Quantum Magnets (2011)
  • 著者名/発表者名: Masahiro Sato, Hosho Katsura, and Naoto Nagaosa
  • 学会等名: APS March Meeting
  • 発表場所: Dallas, USA
  • 年月日: 2011-03-21
• [学会発表] Spin Dynamics in field-induced quadrupolar and octupolar liquid statesin spin-1/2 frustrated chains (2011)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, and Tsutomu Momoi
  • 学会等名: International Conference on Frustration in Condensed Matter(ICFCM)
  • 発表場所: Sendai
  • 年月日: 2011-01-11
• [学会発表] Seven competing phases in the spin-1/2 frustrated J1-J2 chain with easy-plane anisotropy (2011)
  • 著者名/発表者名: Masahiro Sato, Shunsuke Furukawa, Shigeki Onoda and Akira Furusaki
  • 学会等名: International Conference on Frustration in Condensed Matter(ICFCM)
  • 発表場所: Sendai
  • 年月日: 2011-01-11
• [学会発表] Successive Neel and dimer orderings in spin-1/2 ferromagnetic frustrated chain with easy-plane anisotropy (2010)
  • 著者名/発表者名: Masahiro Sato, Shunsuke Furukawa and Akira Furusaki
  • 学会等名: Highly Frustrated Magnetism 2010
  • 発表場所: Johns-Hopkins Univ. Baltimore, USA
  • 年月日: 20100803-05
• [学会発表] NMR relaxation rate and dynamical structure factors in field-induced magnetic multi-polar phases of spin-1/2 frustrated ferromagnetic chains (2010)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi and Akira Furusaki, Johns-Hopkins
  • 学会等名: Highly Frustrated Magnetism 2010
  • 発表場所: Baltimore, USA
  • 年月日: 20100803-05
• [学会発表] Stability of collinear and coplanar phases in stacked spatially anisotropic triangular antiferromagnets under a magnetic field (2010)
  • 著者名/発表者名: Masahiro Sato and Norikazu Todoroki, Johns-Hopkins
  • 学会等名: Highly Frustrated Magnetism 2010
  • 発表場所: Baltimore, USA
  • 年月日: 20100803-05
• [学会発表] Ferromagnetic transition in one-dimensional spin-1/2 Bose and Fermi gases (2010)
  • 著者名/発表者名: Masahiro Sato, Shintaro Takayoshi and Shunsuke Furukawa
  • 学会等名: Quantum Matter in Low Dimensions : Opportunities and Challenges
  • 発表場所: Albanova University Center, Stockholm, Sweden
  • 年月日: 2010-09-07
• [学会発表] Spin dynamics in multipolar phases of one-dimensional quantum frustrated ferromagnet (2010)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi and Akira Furusaki
  • 学会等名: Quantum Matter in Low Dimensions : Opportunities and Challenges
  • 発表場所: Albanova University Center, Stockholm, Sweden
  • 年月日: 2010-09-06
• [学会発表] Phase diagram and competing orders of stacked spatially anisotropic triangular Heisenberg antiferromagnets in magnetic field (2010)
  • 著者名/発表者名: Masahiro Sato and Norikazu Todoroki
  • 学会等名: The International Conference on Frustrated Spin Systems, Cold Atoms, Nanomaterials : Satellite Conference of Stat Phys24
  • 発表場所: Hanoi, Vietnam
  • 年月日: 2010-07-15
• [学会発表] Determination of coefficients of bosonized dimer operators in spin-1/2 antiferromagnetic chains and their application (2010)
  • 著者名/発表者名: Shintaro Takayoshi and Masahiro Sato
  • 学会等名: The International Conference on Frustrated Spin Systems, Cold Atoms, Nanomaterials : Satellite Conference of Stat Phys24
  • 発表場所: Hanoi, Vietnam
  • 年月日: 2010-07-15
• [学会発表] Successive transitions between Neel and dimer phases in spin-1/2 ferromagnetic frustrated chain with easy-plane anisotropy (2010)
  • 著者名/発表者名: Masahiro Sato, Shunsuke Furukawa and Akira Furusaki
  • 学会等名: The International Conference on Frustrated Spin Systems, Cold Atoms, Nanomaterials : Satellite Conference of Stat Phys24
  • 発表場所: Hanoi, Vietnam
  • 年月日: 2010-07-15
• [学会発表] Ferromagnetism in spin-1/2 Bose and Fermi gases confined by elongated potential (2010)
  • 著者名/発表者名: Shintaro Takayoshi, Masahiro Sato and Shunsuke Furukawa
  • 学会等名: APS March meeting
  • 発表場所: Portland, USA
  • 年月日: 2010-03-19
• [学会発表] Field-induced quantum phase transitions of the asymmetric three-leg spin tube (2010)
  • 著者名/発表者名: Toru Sakai, Masahiro Sato, Kouichi Okunishi, Kiyomi Okamoto, Chigak Itoi
  • 学会等名: APS March meeting
  • 発表場所: Portland, USA
  • 年月日: 2010-03-16
• [学会発表] Characterization of multipolar liquid phases in frustrated spin chains from NMR relaxation rate (2010)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi, Akira Furusaki
  • 学会等名: APS March meeting
  • 発表場所: Portland, USA
  • 年月日: 2010-03-16
• [学会発表] Ferromagnetic state and correlation functions in spin-1/2 Fermi and Bose gases (2010)
  • 著者名/発表者名: Shintaro Takayoshi, Masahiro Sato and Shunsuke Furukawa
  • 学会等名: International Symposium on Physics of New Quantum Phases in Superclean Materials(PSM2010)
  • 発表場所: Yokohama, Kanagawa
  • 年月日: 2010-03-01
• [学会発表] How to detect magnetic multipolar liquid phases in spin-1/2 frustrated ferromegnetic chains (2010)
  • 著者名/発表者名: Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi, and Akira Furusaki
  • 学会等名: International Symposium on Physics of New Quantum Phases in Superclean Materials(PSM2010)
  • 発表場所: Yokohama, Kanagawa
  • 年月日: 2010-03-01
• [学会発表] Field and temperature dependence of NMR relaxation rate for multi-polar liquid phases in frustrated spin chains (2010)
  • 著者名/発表者名: Masahiro Sato
  • 学会等名: Magnetic resonance in highly frustrated magnetic systems(HFMR2010)
  • 発表場所: Kranjska Gora, Slovenia
  • 年月日: 2010-02-01
• [学会発表] Chiral order and novel electromagnetic excitations in quasione-dimensional spin-1/2 multiferroics (2009)
  • 著者名/発表者名: Masahiro Sato, Shunsuke Furukawa and Shigeki Onoda
  • 学会等名: RIKEN Workshop on "Emergent Phenomena of Correlated Materials"
  • 発表場所: RIKEN, Wako, Saitama
  • 年月日: 2009-12-03
• [学会発表] Quantum phase transition to ferromagnetic liquid in spinful Bose and Fermi gases (2009)
  • 著者名/発表者名: Masahiro Sato, Shintaro Takayoshi and Shunsuke Furukawa
  • 学会等名: RIKEN Workshop on" Emergent Phenomena of Correlated Materials"
  • 発表場所: RIKEN, Wako, Saitama
  • 年月日: 2009-12-03