Interaction-induced quantum anomalous Hall phase in (111) bilayer of LaCoO3

被引：53

作者：

Wang, Yilin ^{[1
,2
]}

Wang, Zhijun ^{[1
,2
]}

Fang, Zhong ^{[1
,2
,3
]}

Dai, Xi ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 12期

关键词：

SPIN-STATE TRANSITION; SINGLE DIRAC CONE; TOPOLOGICAL INSULATORS;

D O I：

10.1103/PhysRevB.91.125139

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present paper, the Gutzwiller density functional theory (LDA + G) has been applied to study the bilayer system of LaCoO3 grown along the (111) direction on SrTiO3. 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. 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 the nonzero Chern number indicating the possibility of realizing the quantum anomalous Hall effect in this system.

引用

页数：8

共 55 条

[1] BAND-STRUCTURE AND CLUSTER-MODEL CALCULATIONS OF LACOO(3) IN THE LOW-SPIN PHASE [J].