Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide
2020-09
发表期刊CHINESE PHYSICS LETTERS
ISSN0256-307X
卷号37期号:9
发表状态已发表
DOI10.1088/0256-307X/37/9/097301
摘要

We examine quantum anomalous Hall (QAH) insulators with intrinsic magnetism displaying quantized Hall conductance at zero magnetic fields. The spin-momentum locking of the topological edge stats promises QAH insulators with great potential in device applications in the field of spintronics. Here, we generalize Haldane's model on the honeycomb lattice to a more realistic two-orbital case without the artificial real-space complex hopping. Instead, we introduce an intraorbital coupling, stemming directly from the local spin-orbit coupling (SOC). Ourd(xy)/d(x)(2)-y(2)model may be viewed as a generalization of the bismuthenep(x)/p(y)-model for correlatedd-orbitals. It promises a large SOC gap, featuring a high operating temperature. This two-orbital model nicely explains the low-energy excitation and the topology of two-dimensional ferromagnetic iron-halogenides. Furthermore, we find that electronic correlations can drive the QAH states to ac= 0 phase, in which every band carries a nonzero Chern number. Our work not only provides a realistic QAH model, but also generalizes the nontrivial band topology to correlated orbitals, which demonstrates an exciting topological phase transition driven by Coulomb repulsions. Both the model and the material candidates provide excellent platforms for future study of the interplay between electronic correlations and nontrivial band topology.

关键词73 43 -f 03 65 Vf 73 20 -r 73 22 -f
收录类别SCI ; SCIE ; EI
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000570575200001
出版者IOP PUBLISHING LTD
引用统计
文献类型期刊论文
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/123597
专题物质科学与技术学院_硕士生
物质科学与技术学院_PI研究组_李刚组
物质科学与技术学院_本科生
物质科学与技术学院_公共科研平台_拓扑物理实验室
通讯作者Li, Gang
作者单位
1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China;
2.Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China;
3.ShanghaiTech Univ, ShanghaiTech Lab Topol Phys, Shanghai 200031, Peoples R China
第一作者单位物质科学与技术学院
通讯作者单位物质科学与技术学院;  上海科技大学
第一作者的第一单位物质科学与技术学院
推荐引用方式
GB/T 7714
Sui, Qian,Zhang, Jiaxin,Jin, Suhua,et al. Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide[J]. CHINESE PHYSICS LETTERS,2020,37(9).
APA Sui, Qian,Zhang, Jiaxin,Jin, Suhua,Xia, Yunyouyou,&Li, Gang.(2020).Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide.CHINESE PHYSICS LETTERS,37(9).
MLA Sui, Qian,et al."Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide".CHINESE PHYSICS LETTERS 37.9(2020).
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