Thermal conductivity of one-dimensional spin- 1/2 systems coupled to phonons
Thermal conductivity of one-dimensional spin- 1/2 systems coupled to phonons
复制标题
与声子耦合的一维自旋 1/2 系统的热导率
DOI：
10.1103/physrevb.74.235118
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发表时间：
2006
影响因子：
3.7
通讯作者：
X. Zotos
中科院分区：
文献类型：
--
作者：
Kim Louis;P. Prelovšek;X. Zotos
在记忆函数的方法，我们研究的热导率的一维自旋$1 scin 2$海森堡，以及$XY$模型耦合到光学和声学声子使用精确对角化与Lanczos技术和分析评估，分别。我们发现两个模型的热导率相当相似，海森堡模型的热导率的增强主要是由于更大的能流关联。我们还观察到，Wiedemann-Franz定律不服从XY模型，大概是由于非弹性散射过程。
Within the memory function approach we study the thermal conductivity of the one-dimensional spin-$1∕2$ Heisenberg, as well as $XY$ model coupled to optic and acoustic phonons using exact diagonalization with the Lanczos technique and analytical evaluation, respectively. We find that the thermal conductivity of the two models is fairly similar, the enhancement found in the Heisenberg model mainly due to the larger energy current correlations. We also observe that the Wiedemann-Franz law is not obeyed in the $XY$ model, presumably due to the inelastic scattering processes.