| 1/5掺杂反铁磁海森堡自旋链的基态 |
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| 引用本文： | 陆文彬,潘丽华,刘拥军.1/5掺杂反铁磁海森堡自旋链的基态[J].扬州大学学报(自然科学版),2009,12(4). |
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| 作者姓名： | 陆文彬 潘丽华 刘拥军 |
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| 作者单位： | 扬州大学物理科学与技术学院,江苏,扬州,225002 |
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| 基金项目： | 江苏省高校自然科学基金 |
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| 摘 要： | 利用密度矩阵重整化群方法研究1/5掺杂对自旋1/2海森堡反铁磁链的影响.研究表明,掺人侧自旋能减弱近邻自旋关联但增强长程自旋关联,同时侧自旋的掺入破坏了子格对称性,导致系统基态反铁磁和铁磁长程序共存.侧自旋对量子涨落的抑制作用随自旋关联距离的增加而减弱,且其自身受到量子涨落的影响最小.对于1/5掺杂反铁磁海森堡自旋链,量子涨落的影响明显,引起了交错磁化率47%的减弱.
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| 关 键 词： | 准一维反铁磁海森堡自旋链 密度矩阵重整化群 自旋关联 交错磁化率 |
The ground state of the 1/5-doped antiferromagntic spin chain |
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| LU Wen-bin,PAN Li-hua,LIU Yong-jun.The ground state of the 1/5-doped antiferromagntic spin chain[J].Journal of Yangzhou University(Natural Science Edition),2009,12(4). |
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| Authors: | LU Wen-bin PAN Li-hua LIU Yong-jun |
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| Abstract: | By density-matrix renormalization group method, the 1/5-doping effect on the spin-1/2 Heisenberg antiferromagnetic chain is investigated. It is shown that adding side spins can weaken the correlations between near-neighbor spins while strengthen those between long-range spins. Be-cause of the broken of sublattice symmetry by side spins, the ferromagnetic and the antiferromag-netic long range orders can coexist in the ground state. Side spins can lower the quantum fluctua-tions, and the effect will weaken as the increasing of interaction distance. The quantum fluctuation of side spin is weakest. But for the 1/5-doped antiferromagntic chain, the quantum fluctuation leads to the 47 % loss of its staggered susceptibility. |
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| Keywords: | quasi-one dimensional Heisenberg antiferromagnetic chain density-matrix renormaliza-tion group spin correlation function staggered susceptibility |
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