Low-Energy Excitations of the S=1/2 Quantum Spin Tube with the Triangular Lattice Structure(Nanometer-Scale Magnets, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
スポンサーリンク
概要
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In this paper, we investigate the low-energy properties of the S=1/2 anriferromagnetic quantum spin tube with the triangular lattice structure. Using the density matrix renormalization group (DMRG) method, we calculate the singlet-triplet excitation gap up to 144 triangles along the leg direction. Analyzing the size dependence of the gap, we find that the system is gapful for α<1.2. A similar analysis of the low-field edge of the magnetization curve suggests that the system is gapless for α>1.2.
- 2005-10-31
著者
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OKUNISHI Kouichi
Department of Physics, Niigata University
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SAKAI Toru
Department of Physics, Tohoku University
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Okunishi Kouichi
Department Of Physics Faculty Of Science Niigata Univeristy
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Kouichi Okunishi
Department Of Physics Niigata University
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Miyashita Seiji
Department Of Physics The University Of Tokyo
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Miyashita Seiji
Department Of Applied Physics University Of Tokyo
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YOSHIKAWA Shinichiro
Department of Applied Physics, The University of Tokyo
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YOSHIKAWA Shin-ichiro
Department of Applied Physics, The University of Tokyo
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Miyashita Seiji
Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo
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Sakai Toru
Department Of Physics Tohoku University
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Sakai Toru
Department Of Material Science Faculty Of Science Himeji Institute Of Technology
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Yoshikawa Shinichiro
Department Of Applied Physics The University Of Tokyo
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MIYASHITA Seiji
Department of Physics, The University of Tokyo
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OKUNISHI Kouichi
Department of Applied Physics, Graduate School of Engineering Osaka University
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SAKAI Toru
Department of Electronics, Tokyo Metropolitan Institute of Technology
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