Abe homotopy classification of topological excitations under the topological influence of vortices

Shingo Kobayashi, Michikazu Kobayashi, Yuki Kawaguchi +2

Topological excitations are usually classified by the $n$th homotopy group ${\pi }_n$. However, for topological excitations that coexist with vortices, there are case in which an elemen…