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arXiv 1104.3633cond-mat.str-el
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海森堡链中边界散射、磁振子间散射和半导体能隙的确定

Determination of Boundary Scattering, Intermagnon Scattering, and the Haldane Gap in Heisenberg Chains

Hiroshi Ueda, Koichi Kusakabe

摘要:

用非阿贝尔DMRG方法分析了S=1海森堡反铁磁链中的低磁振子色散。确定了边界耦合的散射长度$a_{\rm b}$和磁振子间散射长度$a$。发现散射长度$a_{\rm b}$在交叉点处表现出特征发散行为。相比之下,Half能隙$Δ$、磁振子速度$v$和$a$在交叉处保持恒定。我们的方法允许使用比相关长度$ξ$长的链长度来估计S=2 AF链的间隙为$Δ= 0.0891623(9)$。

英文摘要:

Low-lying magnon dispersion in a S=1 Heisenberg antiferromagnetic (AF) chain is analyzed using the non-Abelian DMRG method. The scattering length $a_{\rm b}$ of the boundary coupling and the inter-magnon scattering length $a$ are determined. The scattering length $a_{\rm b}$ is found to exhibit a characteristic diverging behavior at the crossover point. In contrast, the Haldane gap $Δ$, the magnon velocity $v$, and $a$ remain constant at the crossover. Our method allowed estimation of the gap of the S=2 AF chain to be $Δ= 0.0891623(9)$ using a chain length longer than the correlation length $ξ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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