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arXiv 1409.6797cond-mat.str-elcond-mat.mtrl-sci
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LaCoO $_3$(111)双层膜中相互作用诱导的量子反常霍尔相

Interaction-induced quantum anomalous Hall phase in (111) bilayer of LaCoO$_3$

Yilin Wang, Zhijun Wang, Zhong Fang, Xi Dai

摘要:

本文采用Gutzwiller密度泛函理论(LDA+G)研究了LaCoO $_3$在SrTiO $_3$上沿$(111)$方向生长的双层体系。LDA计算结果表明,Co原子的$e_{g}$带的顶部和底部有两个几乎平坦的带,费米能级与下带相交,下带几乎半满.在LDA+G方法中同时考虑自旋轨道耦合和库仑相互作用后,我们发现自旋轨道耦合和库仑相互作用的相互作用稳定了一个非常稳定的非零Chern数的铁磁绝缘体相,这预示着在该系统中实现量子反常霍尔效应的可能性.

英文摘要:

In the present paper, the Gutzwiller density functional theory (LDA+G) has been applied to study a bilayer system of LaCoO$_3$ grown along the $(111)$ direction on SrTiO$_3$. The LDA calculations show that there are two nearly flat bands located at the top and bottom of $e_{g}$ bands of Co atoms with the Fermi level crossing the lower one, which is almost half-filled. After including both the spin-orbit coupling and the Coulomb interaction in the LDA+G method, we find that the interplay between spin-orbit coupling and Coulomb interaction stabilizes a very robust ferromagnetic insulator phase with non-zero Chern number, which indicates the possibility to realize quantum anomalous Hall effect in this system.

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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