Theory of Multifarious Quantum Phases and Large Anomalous Hall Effect in Pyrochlore Iridate Thin Films
Theory of Multifarious Quantum Phases and Large Anomalous Hall Effect in Pyrochlore Iridate Thin Films
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DOI：
10.1038/srep30017
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发表时间：
2016-07-15
影响因子：
4.6
通讯作者：
Kim, Yong Baek
中科院分区：
文献类型：
--
作者：
Hwang, Kyusung;Kim, Yong Baek
我们从理论上研究了出现在薄膜几何形状的焦绿石iridates，其中一些奇异的量子基态提出发生在散装材料作为电子相关和强自旋轨道耦合之间的相互作用的结果的量子相位。这些体相的命运，以及新的量子状态，可能只出现在薄膜平台，通过一个理论模型，允许层依赖的磁性结构进行了研究。结果表明，在薄膜的几何形状中，磁有序以非均匀的方式发展。这导致了各种磁性金属相在不同层之间具有调制的磁性有序模式。在这些阶段的体和边界电子状态合谋，以促进不寻常的电子性能。特别是，这样的阶段是类似的外尔半金属相在体系统中，他们会表现出异常大的反常霍尔效应。
We theoretically investigate emergent quantum phases in the thin film geometries of the pyrochore iridates, where a number of exotic quantum ground states are proposed to occur in bulk materials as a result of the interplay between electron correlation and strong spin-orbit coupling. The fate of these bulk phases as well as novel quantum states that may arise only in the thin film platforms, are studied via a theoretical model that allows layer-dependent magnetic structures. It is found that the magnetic order develop in inhomogeneous fashions in the thin film geometries. This leads to a variety of magnetic metal phases with modulated magnetic ordering patterns across different layers. Both the bulk and boundary electronic states in these phases conspire to promote unusual electronic properties. In particular, such phases are akin to the Weyl semimetal phase in the bulk system and they would exhibit an unusually large anomalous Hall effect.