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arXiv 1212.2829cond-mat.stat-mech
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一维经典海森堡模中的自旋扩散

Spin diffusion in one-dimensional classical Heisenberg mode

Debarshee Bagchi

摘要:

在一维经典海森堡模型中,采用确定性的奇偶自旋进动动力学,数值研究了自旋扩散问题。我们证明了在这个模型中的自旋扩散,像能量扩散,是正常的,并获得一个长时间的自相关函数(ACF)的衰减扩散的尾巴。一些不同的耦合方案和各向异性的模型的变化进行了研究,我们发现正常的扩散在所有这些。对海森堡模型的系统的有限尺寸分析也表明涨落的扩散扩散,与先前的反常扩散的说法相反。

英文摘要:

The problem of spin diffusion is studied numerically in one-dimensional classical Heisenberg model using a deterministic odd even spin precession dynamics. We demonstrate that spin diffusion in this model, like energy diffusion, is normal and one obtains a long time diffusive tail in the decay of autocorrelation function (ACF). Some variations of the model with different coupling schemes and with anisotropy are also studied and we find normal diffusion in all of them. A systematic finite size analysis of the Heisenberg model also suggests diffusive spreading of fluctuation, contrary to previous claims of anomalous diffusion.

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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