Electrically controllable surface magnetism on the surface of topological insulator

Details Electrically controllable surface magnetism on the surface of topological insulator Electrically controllable surface magnetism on the surface of topological insulator

2010-10-20

arxiv.org/abs/1010.4134v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures, 1 table

Scientific paper

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.

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