2010/10/20 by Jia-Ji Zhu, Dao-Xin Yao, Shou-Cheng Zhang +1 · 1 citation
Physics and Astronomy · #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.106.097201
published as Phys. Rev. Lett 106, 097201 (2011) · 5 pages, 3 figures, 1 table
arxiv created 2010/10/20 · arxiv updated 2012/06/18
We study theoretically the RKKY interaction between magnetic impurities on the surface of three-dimensional topological insulators, mediated by the helical Dirac electrons. Exact analytical expression shows that the RKKY interaction consists of the Heisenberg-like, Ising-like and DM-like terms. It provides us a new way to control surface magnetism electrically. The gap opened by doped magnetic ions can lead to a short-range Bloembergen-Rowland interaction. The competition among the Heisenberg, Ising and DM terms leads to rich spin configurations and anomalous Hall effect on different lattices.