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arXiv 1712.03489cond-mat.mes-hall
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自旋电子学的有效规范场理论

Effective gauge field theory of spintronics

Gen Tatara

摘要:

本文的目的是在有效规范场--自旋规范场概念的基础上,提出一个关于自旋电子学现象的综合理论。当我们改变描述系统的基,描述系统的低能性质时,通常会产生有效的规范场。在铁磁金属中,它是由局域自旋(磁化)结构和传导电子的自旋电流耦合而产生的。本文的前半部分是量子力学的论证和唯象。我们证明了自旋规范场具有绝热和非绝热(非对角)分量,构成一个SU(2)规范场。绝热成分引起自旋Berry相、拓扑霍尔效应和自旋动力,而非绝热成分通过诱导非平衡自旋积累而引起自旋转移矩和自旋泵效应.在论文的后半部分,介绍了场论方法。从微观角度研究了外加自旋极化电流时局域自旋的动力学行为,讨论了电流驱动的畴壁运动。最后介绍了界面自旋轨道相互作用的最新研究进展。

英文摘要:

The aim of this paper is to present a comprehensive theory of spintronics phenomena based on the concept of effective gauge field, the spin gauge field. An effective gauge field generally arises when we change a basis to describe system and describes low energy properties of the system. In the case of ferromagnetic metals we consider, it arises from structures of localized spin (magnetization) and couples to spin current of conduction electron. The first half of the paper is devoted to quantum mechanical arguments and phenomenology. We show that the spin gauge field has adiabatic and nonadiabatic (off-diagonal) components, consisting an SU(2) gauge field. The adiabatic component gives rise to spin Berry's phase, topological Hall effect and spin motive force, while nonadiabatic components are essential for spin-transfer torque and spin pumping effects by inducing nonequilibrium spin accumulation. In the latter part of the paper, field theoretic approaches are described. Dynamics of localized spins in the presence of applied spin-polarized current is studied in a microscopic viewpoint, and current-driven domain wall motion is discussed. Recent developments on interface spin-orbit interaction is also mentioned.

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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