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Bond operator theory of isotropic spin-1 antiferromagnetic chains
Wang, HT; Shen, JL; Su, ZB; Wang, HT , CHINESE ACAD SCI,INST PHYS,POB 603,BEIJING 100080,PEOPLES R CHINA.
1997
发表期刊PHYSICAL REVIEW B
ISSN0163-1829
卷号56期号:22页码:14435-14440
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.
部门归属CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; CHINESE ACAD SCI,CTR CONDENSED MATTER PHYS,BEIJING 100080,PEOPLES R CHINA
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
学科领域Physics
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收录类别SCI
WOS记录号WOS:A1997YL01100037
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被引频次:31[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1978-2010年知识产出
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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