Strong single-ion anisotropy and anisotropic interactions of magnetic adatoms induced by topological surface states
ORAL
Abstract
The nature of the magnetism brought about by Fe adatoms on the surface of the topological insulator Bi$_{\mathrm{2}}$Se$_{\mathrm{3}}$ was examined in terms of density functional calculations. The Fe adatoms exhibit strong easy-axis magnetic anisotropy in the dilute adsorption limit due to the topological surface states (TSS). The spin exchange J between the Fe adatoms follows a Ruderman-Kittel-Kasuya-Yosida behavior with substantial anisotropy, and the Dzyaloshinskii-Moriya interaction between them is quite strong with \textbar D/J\textbar\ $\approx $ 0.3 under the mediation by the TSS, and can be further raised to 0.6 by an external electric field. The apparent single-ion anisotropy of a Fe adatom is indispensable in determining the spin orientation.
*NSFC, FANEDD, Pujiang Plan, Eastern Scholar
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Authors
Zheng-Lu Li
Departmenf of Physics, Fudan University
Key Laboratory of Computational Physical Sciences (MOE), State Key Laboratory of Surface Physics, and Dept of Physics, Fudan University, Shanghai
Ji-Hui Yang
Departmenf of Physics, Fudan University
Key Laboratory of Computational Physical Sciences (MOE), State Key Laboratory of Surface Physics, and Dept of Physics, Fudan University, Shanghai
Guohong Chen
Departmenf of Physics, Fudan University
M.-H. Whangbo
Department of Chemistry, North Carolina State University
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
Hongjun Xiang
Fudan University
Departmenf of Physics, Fudan University
Key Laboratory of Computational Physical Sciences (MOE), State Key Laboratory of Surface Physics, and Dept of Physics, Fudan University, Shanghai
Xingao Gong
Fudan University
Departmenf of Physics, Fudan University
Fudan Univerisity
Key Laboratory of Computational Physical Sciences (MOE), State Key Laboratory of Surface Physics, and Dept of Physics, Fudan University, Shanghai
