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Determination of boundary scattering, magnon-magnon scattering, and the Haldane gap in Heisenberg spin chains

机译:海森堡自旋链的边界散射,磁振子-磁振子散射和霍尔丹间隙的测定

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摘要

Low-lyingmagnon dispersion in a S = 1 Heisenberg antiferromagnetic (AF) chain is analyzed using the non-Abelian density-matrix-renormalization-group (DMRG) method. The scattering length ab of the boundary coupling and the intermagnon scattering length a are determined. The scattering length Ob is found to exhibit a characteristic diverging behavior at the crossover point. In contrast, the Haldane gap A, the magnon velocity v, and a remain constant at the crossover. Our method allowed estimation of the gap of the 5 = 2 AF chain to be △ = 0.081623(9) using a chain length longer than the correlation length ξ.
机译:使用非阿贝尔密度矩阵重归一化组(DMRG)方法分析了S = 1海森堡反铁磁(AF)链中的低磁强子弥散。确定边界耦合的散射长度ab和磁强散射长度a。发现散射长度Ob在交叉点处表现出特征性的发散行为。相反,霍尔丹气隙A,磁振速度v和交点处的a保持恒定。我们的方法允许使用比相关长度ξ长的链长来估计5 = 2 AF链的间隙为△= 0.081623(9)。

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