Quantum Spin Systems and Classical Dynamics

量子自旋系统和经典动力学

• 批准号: 21540381
• 负责人: OSHIKAWA Masaki
• 金额: $ 2.66万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21540381/
• 关键词: 物性基礎論; 磁性; 統計力学; 量子ダイナミクス; 量子古典対応; 電子スピン共鳴; 量子臨界現象; 国際研究者交流 アメリカ合衆国; 場の理論; 相転移

For the temperature regime where time evolution of a quantum spin system is described by a classical field theory, spectral shape of the Electron Spin Resonance is determined using classical equation of motion. It is difficult to obtain the spectral shape with other methods. On Heisenberg antiferromagnetic chain under a staggered field, a crossover between paramagnetic and antiferromagnetic resonances, and accompanying change in the spectral shape are demonstrated. Our approach based on the classical equation motion provides insights complimentary to those obtained in other approaches.

在用经典场论描述量子自旋系统的时间演化的温度范围内，用经典运动方程确定了电子自旋共振的谱形。用其他方法很难获得光谱形状。在交错电场作用下的海森堡反铁磁链上，出现了顺磁和反铁磁共振的交叉，并伴随着谱形的变化。我们的方法基于经典的方程运动，提供了对其他方法所获得的见解的补充。

项目成果

Perturbation theory of ESR shifts in Haldane chains with uniaxial anisotropies and its application to NDMAP

单轴各向异性 Haldane 链 ESR 位移的微扰理论及其在 NDMAP 中的应用

• 发表时间: 2010
• 作者: S. C. Furuya;Y. Maeda;and M. Oshikawa
• 通讯作者: and M. Oshikawa

Boundary Bound States in S=1/2 Antiferromagnetic Chains and Electron Spin Resonance

S=1/2反铁磁链中的边界束缚态与电子自旋共振

• 作者: S. C. Furuya;M. Oshikawa;and I. Affleck;T.Koyama;K.Okidono;Masaki Oshikawa
• 通讯作者: Masaki Oshikawa

Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase

二聚体相中S=1反铁磁键交替链的场论分析

• DOI: 10.1103/physrevb.85.134431
• 发表时间: 2012
• 期刊: Phys. Rev
• 作者: K. Oyoshi;S. Nigo;J. Inoue;O. Sakai;H. Kitazawa and G. Kido;S.Hikami;Hiroya Nakao;上田光一;J. Tamaki and M. Oshikawa
• 通讯作者: J. Tamaki and M. Oshikawa

Frequency Shift of Electron Spin Resonance

电子自旋共振的频移

• 发表时间: 2011
• 作者: 酒井治;播磨尚朝;鈴木孝至;服部翠;Masaki Oshikawa;酒井治;服部翠;T.Suzuki;M. Oshikawa
• 通讯作者: M. Oshikawa

Semiclassical approach to electron spin resonance in quantum spin systems

• DOI: 10.1103/physrevb.83.224417
• 发表时间: 2011-02
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: S. Furuya;M. Oshikawa;I. Affleck