The universal definition of spin current.

The universal definition of spin current.
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自旋电流的通用定义

DOI:
10.1038/srep00388
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Liu, C.
Liu, C.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
An, Z.;Liu, F. Q.;Lin, Y.;Liu, C.

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根据量子电动力学,自旋流、轨道角动量流和总角动量流已被普遍定义为张量形式。在不同情况下讨论了它们的守恒量和连续性方程。推导了非相对论近似形式,解释了它们的物理意义,并对一些实验结果进行了分析。计算了HgTe/CdTe量子威尔斯阱中螺旋边态的自旋流,研究了二维量子自旋霍尔系统的自旋流性质.根据运动介质中的电动力学理论,导出了半导体介质中的广义自旋轨道耦合项。在自旋电子学中,用有效总角动量流代替纯自旋流来描述极化分布和输运性质是可取的。
The spin current, orbit angular momentum current and total angular momentum current in a tensor form have been universally defined according to the quantum electrodynamics. Their conservation quantities and the continuity equations have been discussed in different cases. Non-relativistic approximation forms are deduced in order to explain their physical meanings, and to analyze some experimental results. The spin current of helical edge states in HgTe/CdTe quantum wells is calculated to demonstrate the properties of the spin current of the two dimensional quantum spin-Hall system. A generalized spin-orbit coupling term in the semiconducting media is deduced based on the theory of the electrodynamics in the moving media. It is recommended to use the effective total angular momentum current instead of the pure spin current to describe the distribution of polarization and the transport properties in spintronics.
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