Confinement-driven transitions between topological and Mott phases in (LaNiO3)N/(LaAlO3)M(111) superlattices

被引：65

作者：

Doennig, David ^{[1
,2
]}

Pickett, Warren E. ^{[3
]}

Pentcheva, Rossitza ^{[1
,2
]}

机构：

[1] Univ Munich, Dept Earth & Environm Sci, Sect Crystallog, D-80333 Munich, Germany

[2] Univ Munich, Ctr Nanosci, D-80333 Munich, Germany

[3] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.89.121110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A set of broken-symmetry two-dimensional ground states is predicted in (111)-oriented (LaNiO3)(N)/(LaAlO3)(M) (N/M) superlattices, based on density functional theory calculations including a Hubbard U term. An unanticipated Jahn-Teller distortion with d(z2) orbital polarization and a ferromagnetic Mott-insulating (and multiferroic) phase emerges in the double perovskite (1/1), that shows strong susceptibility to strain-controlled orbital engineering. The LaNiO3 bilayer with graphene topology has a switchable multiferroic (ferromagnetic and ferroelectric) insulating ground state with inequivalent Ni sites. Beyond N = 3 the confined LaNiO3 slab undergoes a metal-to-insulator transition through a half-semimetallic phase with conduction originating from the interfaces. Antiferromagnetic arrangements allow combining motifs of the bilayer and single trigonal layer band structures in designed artificial mixed phases.

引用

页数：5

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