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Wang, HT; Shen, JL; Su, ZB; Wang, HT , CHINESE ACAD SCI,INST PHYS,POB 603,BEIJING 100080,PEOPLES R CHINA.
Bond operator theory of isotropic spin-1 antiferromagnetic chains
发表期刊PHYSICAL REVIEW B
关键词Ground-state Properties Quantum Heisenberg Antiferromagnets Haldane-gap Antiferromagnets Monte-carlo Calculation Mean-field Theory Elementary Excitations Uniaxial Anisotropy Symmetry-breaking Arbitrary Spins Composite Spin
摘要The bond operator representation of quantum S=1/2 spins with the singlet state being projected out is applied to investigate the isotropic spin-1 Heisenberg antiferromagnetic chain H=Sigma(i)[S-i.Si+1-beta(S-i.Si+1)(2)]. Tn the approximation of Bose condensation, the ground-state properties of the system and their beta dependences are studied. The results at Heisenberg point beta=0 and at valence-bond-solid (VBS) point beta=-1/3 agree quite well with the analytical, numerical, and experimental studies. The excitation spectrum is nonsymmetric with respect to k=pi/2 and shows a minimum at k=pi. The beta dependences of the ground-state energy and the excitation gap show the similarities between the Heisenberg point and VBS point. The related properties of the spin ladders are also discussed.
1997
ISSN0163-1829
卷号56期号:22页码:14435-14440
学科领域Physics
收录类别SCI
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被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12401
专题理论物理所科研产出_SCI论文
通讯作者Wang, HT , CHINESE ACAD SCI,INST PHYS,POB 603,BEIJING 100080,PEOPLES R CHINA.
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Wang, HT,Shen, JL,Su, ZB,et al. Bond operator theory of isotropic spin-1 antiferromagnetic chains[J]. PHYSICAL REVIEW B,1997,56(22):14435-14440.
APA Wang, HT,Shen, JL,Su, ZB,&Wang, HT , CHINESE ACAD SCI,INST PHYS,POB 603,BEIJING 100080,PEOPLES R CHINA..(1997).Bond operator theory of isotropic spin-1 antiferromagnetic chains.PHYSICAL REVIEW B,56(22),14435-14440.
MLA Wang, HT,et al."Bond operator theory of isotropic spin-1 antiferromagnetic chains".PHYSICAL REVIEW B 56.22(1997):14435-14440.
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