Model Hamiltonian for the Quantum Anomalous Hall State in Iron-Halogenide

来源 :中国物理快报(英文版) | 被引量 : 0次 | 上传用户:shanyuqi0513
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
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 Haldanes 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).Our dxy/dx2-y2 model may be viewed as a generalization of the bismuthene px/py-model for correlated d-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 a c =0 phase,in which every band carries a nonzero Che 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.
其他文献
期刊
2013年10月15日~18日,第十二届中国国际工程机械、建材机械及矿山机械展览与技术交流会(BICES2013)在北京九华会展中心举行。在本次展会上,山推凭借着“价值引领,共赢未来”
2003年,作为国际成熟市场的后来者,江苏柳工机械有限公司这支小型工程机械新军,在江苏镇江举行了奠基仪式。此举标志着柳工向着建设开放的国际化的柳工目标又迈出了坚实的一
七十年代以来,褐稻虱一直是我国水稻主要害虫之一。过去由于只重视施药防治,带来了许多不良后果。不但没有控制此虫为害,杀伤了天敌,造成了害虫猖獗,环境和稻谷污染等等。为
This paper proposes a method of repairing interface defects by supercritical nitridation technology,in order to suppress the threshold voltage shift of AlGaN/Ga
期刊
6月11日,广州国际节电暨新能源技术与设备展览会(ESE Expo Guangzhou)在广州召开。本届展会围绕“能效提升,节能改造”的主题,作为系统解决方案提供商的四方电气特携旗下CA500重载
在BICES2013厦工展区中,挖掘机、装载机、泵车、叉车、混凝土搅拌运输车、压路机、平地机等产品,琳琅满目。厦工以全系列产品阵容向世人展示了厦工产品的卓越品质,充分展示了厦
Transparent conducting materials (TCMs) have been widely used in optoelectronic applications such as touch-screens,fiat panel displays and thin film solar cells
期刊
Two-dimensional (2D) blue phosphorene with a honeycomb structure is the phosphorus analog of graphene,and is regarded as a promising 2D material with a large tu
期刊
Nonclassicality of optical states,as a key characteristic of bosonic fields,is a valuable resource for quantum information processing.We investigate the generat
期刊