2 research outputs found
Electrically controllable surface magnetism on the surface of topological insulator
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.Comment: 5 pages, 3 figures, 1 tabl
Electrically-controllable RKKY interaction in semiconductor quantum wires
We demonstrate in theory that it is possible to all-electrically manipulate
the RKKY interaction in a quasi-one-dimensional electron gas embedded in a
semiconductor heterostructure, in the presence of Rashba and Dresselhaus
spin-orbit interaction. In an undoped semiconductor quantum wire where
intermediate excitations are gapped, the interaction becomes the short-ranged
Bloembergen-Rowland super-exchange interaction. Owing to the interplay of
different types of spin-orbit interaction, the interaction can be controlled to
realize various spin models, e.g., isotropic and anisotropic Heisenberg-like
models, Ising-like models with additional Dzyaloshinsky-Moriya terms, by tuning
the external electric field and designing the crystallographic directions. Such
controllable interaction forms a basis for quantum computing with localized
spins and quantum matters in spin lattices.Comment: 5 pages, 1 figur