Skyrmion-induced bound states on the surface of three-dimensional topological insulatorsSkyrmion-induced bound states on the surface of three-dimensional topological insulators
Faculty of Sciences. Physics
Condensed Matter Theory
2016New York, N.Y. :American Institute of Physics, 2016
Journal of applied physics / American Institute of Physics. - New York, N.Y., 1937, currens
119(2016):19, 10 p.
University of Antwerp
The interaction between the surface of a 3D topological insulator and a skyrmion/anti-skyrmion structure is studied in order to investigate the possibility of electron confinement due to the skyrmion presence. Both hedgehog (Neel) and vortex (Bloch) skyrmions are considered. For the hedgehog skyrmion, the in-plane components cannot be disregarded and their interaction with the surface state of the topological insulator (TI) has to be taken into account. A semi-classical description of the skyrmion chiral angle is obtained using the variational principle. It is shown that both the hedgehog and the vortex skyrmion can induce bound states on the surface of the TI. However, the number and the properties of these states depend strongly on the skyrmion type and the skyrmion topological number N-Sk. The probability densities of the bound electrons are also derived where it is shown that they are localized within the skyrmion region. Published by AIP Publishing.