二维铁磁材料中与自旋方向相关的量子反常霍尔效应

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Chinese Physics B Pub Date : 2023-12-08 DOI:10.1088/1674-1056/ad1380

Yu-Xian Yang, Chang-Wen Zhang

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引用次数: 0

摘要

我们提出了一种在二维(2D)材料中实现由自旋轨道耦合(SOC)强度驱动的自旋方向相关量子反常霍尔效应(QAHE)的方案。基于sp 3紧密结合(TB)模型，我们发现这些体系可以分别拥有面外和面内磁化的弱荷电晶体，其中量子跃迁机制主要由px,y / pz轨道的能带反转驱动。作为一个具体的例子，基于第一性原理计算，我们实现了一种真实的单层1T-SnN2/PbN2材料，其面内/面外磁化具有非零陈恩数C和拓扑边缘态。这些发现为追求依赖自旋方向的qhe提供了有用的指导，从而激发了直接的实验兴趣。

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Spin-direction dependent Quantum Anomalous Hall effect in two-dimensional ferromagnetic materials

We propose a scheme for realizing spin-direction dependent Quantum Anomalous Hall Effect (QAHE) driven by spin-orbit couplings (SOC) strength in two-dimensional (2D) materials. Based on the sp 3 tight-binding (TB) model, we find that these systems can harbor QAHE with out-of-plane and in-plane magnetization for the weak and strong SOC, respectively, in which the mechanism of quantum transition is mainly driven by the band inversion of p x,y /p z orbitals. As a concrete example, based on first-principles calculations, we realize a real material of monolayer 1T-SnN2/PbN2 to exhibit QAHE with in-plane/out-of-plane magnetization characterized by the nonzero Chern number C and topological edge states. These findings provide useful guidance for the pursuit of spin-direction-dependent QAHE and hence stimulate immediate experimental interest.

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来源期刊

Chinese Physics B 物理-物理：综合

CiteScore

2.80

自引率

23.50%

发文量

15667

审稿时长

2.4 months

期刊介绍： Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.