arXiv 1107.03322011-07hep-thcond-mat.mes-hall

规范对称性在自旋电子学中的作用

The role of gauge symmetry in spintronics

R. F. Sobreiro, V. J. Vasquez Otoya

备注：: One reference corrected. 8 pages, no figures. Final version to appear in Annals of Physics
发表信息：: Annals Phys. 326 (2011) 3067-3074
DOI：: 10.1016/j.aop.2011.08.003

摘要：

在这项工作中，我们采用场论的方法来解释自旋电子学中的非保守自旋电流的性质。特别地，我们考虑了经典水平上电磁场的通常U（1）规范理论，得到了包含自旋流和自旋转移矩的破缺连续性方程。受A.弗内斯湾L. Gyorffy和P. Weinberger在他们根据相对论量子力学得到这样的方程的地方，我们根据场论中众所周知的电流如Bargmann-Wigner电流和手征电流将他们的结果形式化。因此，自旋电子学的解释提供了诺特电流（保守或不）和电磁的对称性。事实上，目前的工作的主要结果是，自旋流的不守恒是与物理观测量的规范不变性的破缺项是成比例的手征电流。此外，我们推广了他们的结果，包括作为一个动力场的电磁场，而不是外部的。

英文摘要：

In this work we employ a field theoretical approach to explain the nature of the non-conserved spin current in spintronics. In particular, we consider the usual U(1) gauge theory for the electromagnetism at classical level in order to obtain the broken continuity equation involving the spin current and spin-transfer torque. Inspired in the recent work of A. Vernes, B. L. Gyorffy and P. Weinberger where they obtain such equation in terms of relativistic quantum mechanics, we formalize their result in terms of the well known currents of field theory such as the Bargmann-Wigner current and the chiral current. Thus, an interpretation of spintronics is provided in terms of Noether currents (conserved or not) and symmetries of the electromagnetism. In fact, the main result of the present work is that the non-conservation of the spin current is associated to the gauge invariance of physical observables where the breaking term is proportional to the chiral current. Moreover, we generalize their result by including the electromagnetic field as a dynamical field instead of an external one.

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摘要：

英文摘要：

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