Ground-State Phase Diagram of the Spin-1/2-1/2-1-1 Chain : Condensed Matter: Electronic Properties, etc.
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概要
- 論文の詳細を見る
We investigate the ground-state phase diagram of the quantum mixed spin chain in which two S=1/2 and two S=1 spins are arranged alternatively and isotropic exchange interactions between nearest-neighboring pairs of spins are assumed. Guided by our previous results [J. Phys. Soc. Jpn. 67 (1998) 1000] for a few limiting cases of the exchange interactions, we carry out a density-matrix renormalization-group calculation to determine the ground-state phase diagram in detail. From the gapless points of the singlet-triplet energy gap, five boundary lines are determined, which divide the phase diagram into six regions. In three regions the ground states with the Haldane-phase character appear, while in the remaining three regions those with the dimer character appear. We also present a characterization of the phases concerning how the ground state in each phase is represented in the framework of the valence-bond-solid (VBS) picture. Making use of the matrix-product wave function, we classify the VBS pictures and interpret the ground-state phase diagram in terms of symmetries schematically related to the VBS pictures. We investigated the ground-state nearest-neighboring two-spin correlation functions and a kind of string order parameters, by which we confirm the validity of the characterization.
- 社団法人日本物理学会の論文
- 2000-04-15
著者
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西野 友年
神戸大理
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MIYASHITA Seiji
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo
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鏑木 誠
神戸大学国際文化学部
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TONEGAWA Takashi
Department of Mechanical Engineering, Fukui University of Technology
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NISHINO Tomotoshi
Department of Physics, Graduate School of Science, Kobe University
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康 敏
神戸大学国際文化学研究科
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HIKIHARA Toshiya
Division of Physics, Graduate School of Science, Hokkaido University
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Hikihara T
National Institute For Materials Science
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Hikihara Toshiya
Division Of Information And Media Science Graduate School Of Science And Techmology Kobe University
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Tonegawa T
Department Of Mechanical Engineering Fukui University Of Technology
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Tonegawa Takashi
Department Of Earth And Environmental Sciences Graduate School Of Environmental Studies Nagoya Unive
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Tonegawa Takashi
Department Of Mechanical Engineering Fukui Uneversity Of Technology
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Kaburagi Makoto
Graduate School Of Intercultural Studies Kobe University
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HIKIHARA Toshiya
Graduate School of Science and Technology, Kobe University
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Tonegawa Takashi
Faculty Of Engineering Fukui University Of Technology
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Miyashita S
Univ. Tokyo Tokyo Jpn
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Mikeska H‐j
Institut Fur Theoretische Physik Universitat Hannover
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KABURAGI Makoto
Department of Informatics, Faculty of Cross-Cultural Studies, Kobe University
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MIKESKA Hans-Jurgen
Institut fur Theoretische Physik, Universitat Hannover
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Mikeska Hans-jurgen
Institut Fur Theoretische Physik Universitat Hannover
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Miyashita Seiji
Department Of Physics University Of Tokyo
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Miyashita Seiji
Department Of Physics School Of Science The University Of Tokyo
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Nishino Tomotoshi
Department Of Physics Faculty Of Science Kobe University
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Miyashita Seiji
Graduate School Of Human And Environmental Studies Kyoto University
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Miyashita Seiji
Department Of Applied Physics 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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鏑木 誠
神戸大学国際文化学研究科
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Miyashita Seiji
Crest Jst
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MIYASHITA Seiji
Department of Applied Physics, University of Tokyo
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MIYASHITA Seiji
Department of Applied Physics, School of Engineering, University of Tokyo
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MIYASHITA Seiji
Department of Physics, School of Science, The University of Tokyo
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MIYASHITA Seiji
Faculty of Integrated Human Studies, Kyoto University
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KABURAGI Makoto
Faculty of Cross-Cultural-Studies, Kobe University
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KABURAGI Makoto
Department of Physics, Osaka University
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