Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling

被引：100

作者：

Hoegl, Petra ^{[1
]}

Frank, Tobias ^{[1
]}

Zollner, Klaus ^{[1
]}

Kochan, Denis ^{[1
]}

Gmitra, Martin ^{[2
]}

Fabian, Jaroslav ^{[1
]}

机构：

[1] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[2] Pavol Jozef Safarik Univ, Dept Theoret Phys & Astrophys, Kosice 04001, Slovakia

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 13期

关键词：

GRAPHITE; MNPSE3;

D O I：

10.1103/PhysRevLett.124.136403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate an effective model of proximity modified graphene (or symmetrylike materials) with broken time-reversal symmetry. We predict the appearance of quantum anomalous Hall phases by computing bulk band gap and Chern numbers for benchmark combinations of system parameters. Allowing for staggered exchange field enables quantum anomalous Hall effect in flat graphene with Chern number C = 1. We explicitly show edge states in zigzag and armchair nanoribbons and explore their localization behavior. Remarkably, the combination of staggered intrinsic spin-orbit and uniform exchange coupling gives topologically protected (unlike in time-reversal systems) pseudohelical states, whose spin is opposite in opposite zigzag edges. Rotating the magnetization from out of plane to in plane makes the system trivial, allowing us to control topological phase transitions. We also propose, using density functional theory, a material platform-graphene on Ising antiferromagnet MnPSe3-to realize staggered exchange (pseudospin Zeeman) coupling.

引用

页数：6

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