arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1409.6715cond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
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磁性拓扑绝缘体中的量子反常霍尔效应

Quantum anomalous Hall effect in magnetic topological insulators

Jing Wang, Biao Lian, Shou-Cheng Zhang

摘要:

寻找物质的拓扑非平凡态已成为凝聚态物理的一个重要目标。本文从理论上介绍了二维和三维磁性拓扑绝缘体的量子反常霍尔效应。在二维拓扑绝缘体中,磁有序破坏了反向传播螺旋边缘态之间的对称性,量子自旋霍尔效应可以演化为QAH效应。在3D中,磁有序为拓扑表面态打开了一个缺口,并且已经预测了手征边缘态存在于磁畴壁上。给出了磁性拓扑绝缘体薄膜中的相图,并对磁性掺杂拓扑绝缘体中铁磁有序的基本机制进行了评述。我们还回顾了最近QAH效应的实验观察。我们讨论了最近的理论工作的螺旋和手征边缘状态的共存,多通道手征边缘状态,平台过渡的理论,和QAH效应的厚度依赖性。

英文摘要:

The search for topologically non-trivial states of matter has become an important goal for condensed matter physics. Here, we give a theoretical introduction to the quantum anomalous Hall (QAH) effect based on magnetic topological insulators in two-dimension (2D) and three-dimension (3D). In 2D topological insulators, magnetic order breaks the symmetry between the counter-propagating helical edge states, and as a result, the quantum spin Hall effect can evolve into the QAH effect. In 3D, magnetic order opens up a gap for the topological surface states, and chiral edge state has been predicted to exist on the magnetic domain walls. We present the phase diagram in thin films of a magnetic topological insulator and review the basic mechanism of ferromagnetic order in magnetically doped topological insulators. We also review the recent experimental observation of the QAH effect. We discuss more recent theoretical work on the coexistence of the helical and chiral edge states, multi-channel chiral edge states, the theory of the plateau transition, and the thickness dependence in the QAH effect.

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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