Bond operator theory of isotropic spin-1 antiferromagnetic chains

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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.
刊名	PHYSICAL REVIEW B
	1997
卷号	56 期号:22 页码:14435-14440
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
ISSN号	0163-1829
英文摘要	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.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:A1997YL01100037
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/12401]
专题	理论物理研究所_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.
推荐引用方式 GB/T 7714	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.