Crossover Behavior of Magnetic Excitations in the Anisotropic Haldane Antiferromagnet under High Magnetic Fields(Low Dimensional Systems, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)

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概要

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• Field-induced magnetic phases are investigated in the one-dimensional S=1 Haldane system with the easy-plane anisotropy under external magnetic fields along an arbitrary direction, using the density-matrix renormalization group method. At a critical field the system exhibits the quantum phase transition from the nonmagnetic Haldane phase to a magnetic phase. It is found that the quantum analog of the classical soliton bearing system is induced except for the case where the field is applied perpendicular to the easy plane. In the exceptional case, Tomonaga-Luttiger spin-fluid state is realized. The angle dependence of the critical field is discussed in connection with two consecutive field-induced phase transitions observed in NDMAP. Possible implications for such novel transitions are given.

• 理論物理学刊行会の論文
• 2005-10-31

著者

• Harada Isao

  Department Of Physics Faculty Of Science Kobe University

• Miyazaki Hiroshi

  Department Of Cardiology Kyoto First Red Cross Hospital

• Miyazaki Hiroshi

  Department Of Physics Faculty Of Science Okayama University

• Miyazaki Hiroshi

  Department Of Applied Physics Tohoku University

• Miyazaki Hiroshi

  Department Applied Physics Tohoku University

• Harada Isao

  Okayama Univ. Okayama

• MIYAZAKI Hiroshi

  Department of Physics, Faculty of Science, Okayama University

• HARADA Isao

  Department of Physics, Faculty of Science, Okayama University

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