particular focus on Cu x Bi 2 Se 3 as a candidate material. We find that the lowest-energy
topological excitations are coreless vortices: a bound state of two spatially separated half-
quantum vortices. These objects are nematic Skyrmions, since they are characterized by an
additional topological charge. The inter-Skyrmion forces are dipolar in this model, ie,
attractive for certain relative orientations of the Skyrmions, hence forming multi-Skyrmion …