Spin accumulation in the spin Nernst effect
Spin accumulation in the spin Nernst effect
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DOI：
10.1103/physrevb.106.045203
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发表时间：
2022-05
影响因子：
3.7
通讯作者：
A. Shitade
中科院分区：
文献类型：
--
作者：
A. Shitade
自旋能斯特效应是自旋电流垂直于温度梯度流动的现象。类似于自旋霍尔效应，这种现象也会导致自旋在边界处积累。本文利用绿色函数研究了自旋对温度梯度的响应。我们的形式主义预测了物理上可观察到的自旋积累，而没有关于自旋电流或磁化校正的定义的模糊性。我们证明了广义莫特之间的关系的电和热响应假设存在的时间反演对称性和非弹性散射的情况下。我们还发现，在第一玻恩近似下，三维Luttinger模型的热自旋积累为零，而二维Rashba模型的热自旋积累为非零.
The spin Nernst effect is a phenomenon in which the spin current flows perpendicular to a temperature gradient. Similar to the spin Hall effect, this phenomenon also causes spin accumulation at the boundaries. Here, we study the spin response to the gradient of the temperature gradient with the use of Green’s functions. Our formalism predicts physically observable spin accumulation without the ambiguity regarding the definition of the spin current or the magnetization correction. We prove the generalized Mott relation between the electric and thermal responses assuming the presence of time-reversal symmetry and the absence of inelastic scattering. We also find that thermal spin accumulation vanishes for the three-dimensional Luttinger model but is nonzero for the two-dimensional Rashba model with δ -function nonmagnetic disorder in the first Born approximation.