Kikuchi Toru, Koretsune Takashi, Arita Ryotaro, Tatara Gen
RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Phys Rev Lett. 2016 Jun 17;116(24):247201. doi: 10.1103/PhysRevLett.116.247201. Epub 2016 Jun 13.
We present a physical picture for the emergence of the Dzyaloshinskii-Moriya (DM) interaction based on the idea of the Doppler shift by an intrinsic spin current induced by spin-orbit interaction under broken inversion symmetry. The picture is confirmed by a rigorous effective Hamiltonian theory, which reveals that the DM coefficient is given by the magnitude of the intrinsic spin current. Our approach is directly applicable to first principles calculations and clarifies the relation between the interaction and the electronic band structures. Quantitative agreement with experimental results is obtained for the skyrmion compounds Mn_{1-x}Fe_{x}Ge and Fe_{1-x}Co_{x}Ge.
我们基于在空间反演对称性破缺情况下由自旋轨道相互作用诱导的本征自旋流所产生的多普勒频移概念，给出了关于Dzyaloshinskii-Moriya（DM）相互作用出现的物理图像。该图像通过严格的有效哈密顿理论得到证实，该理论表明DM系数由本征自旋流的大小给出。我们的方法可直接应用于第一性原理计算，并阐明了这种相互作用与电子能带结构之间的关系。对于斯格明子化合物Mn₁₋ₓFeₓGe和Fe₁₋ₓCoₓGe，我们获得了与实验结果的定量一致性。
