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arXiv 1201.3446cond-mat.str-elcond-mat.other
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无序系统的轨道磁化理论

Theory of orbital magnetization in disordered systems

Guobao Zhu, Shengyuan A. Yang, Cheng Fang, W. M. Liu, Yugui Yao

摘要:

在规范协变Wigner空间中,基于Keldysh格林函数理论,给出了无序系统轨道磁化强度的一般公式。该方法从一开始就保证了物理量的规范不变性,并且很容易包含顶点修正。我们的公式不仅适用于绝缘体,但也适用于金属系统的准粒子的行为通常是强烈修改的无序散射。在没有无序的情况下,我们的公式恢复了以前从半经典理论和微扰理论得到的结果。作为应用,我们计算了具有Rashba自旋轨道耦合的弱无序二维电子气的轨道磁化强度。我们发现,对于短程无序散射,它的主要作用是使对应于准粒子能量重整化的轨道磁化强度分布发生移动。

英文摘要:

We present a general formula of the orbital magnetization of disordered systems based on the Keldysh Green's function theory in the gauge-covariant Wigner space. In our approach, the gauge invariance of physical quantities is ensured from the very beginning, and the vertex corrections are easily included. Our formula applies not only for insulators but also for metallic systems where the quasiparicle behavior is usually strongly modified by the disorder scattering. In the absence of disorders, our formula recovers the previous results obtained from the semiclassical theory and the perturbation theory. As an application, we calculate the orbital magnetization of a weakly disordered two-dimensional electron gas with Rashba spin-orbit coupling. We find that for the short range disorder scattering, its major effect is to the shifting of the distribution of orbital magnetization corresponding to the quasiparticle energy renormalization.

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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