Phase diagrams of the Kane-Mele-Hubbard model in the presence of an external magnetic field

National Conference on Theory of Magnetism

Quan, Ya-Min^1 ; Bao, Wei-Cheng^1 ; Wang, Wei-Hua^2 ; Liu, Da-Yong^1

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei

230031, China^1

Department of Electronics, Tianjin Key Laboratory of Photo-Electronic Thin Film Devices and Technology, Nankai University, Tianjin

300071, China^2

关键词: Antiferromagnetic phasis;    External magnetic field;    Local moments;    Slave bosons;    Spin-orbital coupling;    Strong electron correlations;    Transverse magnetic field;    Zeeman magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/827/1/012009/pdf
DOI  :  10.1088/1742-6596/827/1/012009

来源: IOP

【 摘 要 】

We studied the Kane-Mele-Hubbard model at half filling with Zeeman magnetic field using rotationally invariant slave boson method. The competition between external magnetic field and spin orbital coupling at large Hubbard U is explored. It is found that different canted antiferromagnetic phases exist in the presence of longitudinal and transverse magnetic fields. With longitudinal external magnetic field and strong electron correlation, the z component of the local moment is preferred by the finite spin-orbital coupling.