Possible interaction-driven topological phases in (111) bilayers of LaNiO3

被引：137

作者：

Yang, Kai-Yu ^{[1
]}

Zhu, Wenguang ^{[2
,3
]}

Xiao, Di ^{[2
]}

Okamoto, Satoshi ^{[2
]}

Wang, Ziqiang ^{[1
]}

Ran, Ying ^{[1
]}

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 20期

关键词：

AUGMENTED-WAVE METHOD; ELECTRONIC-STRUCTURE; SUPERLATTICES; INSULATORS; MODEL; IONS;

D O I：

10.1103/PhysRevB.84.201104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use the variational mean-field approach to systematically study the phase diagram of a bilayer heterostructure of the correlated transition-metal oxide LaNiO3, grown along the (111) direction. The Ni3+ ions with a d(7) (or e(g)(1)) configuration form a buckled honeycomb lattice. We show that, as a function of the strength of the on-site interactions, various topological phases emerge. In the presence of a reasonable size of the Hund's coupling, as the correlation is tuned from intermediate to strong, the following sequence of phases is found: (1) a Dirac half-semimetal phase, (2) a quantum anomalous Hall insulator (QAHI) phase with Chern number one, and (3) a ferromagnetic nematic phase breaking the lattice point-group symmetry. The spin-orbit couplings and magnetism are both dynamically generated in the QAHI phase.

引用

页数：4

共 32 条

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