“…The self-dual equations of higher dimensional gauge theories were also revealed in 1980s [18,19,20,21,22,24,25,23,26]. An explicit recipe for the derivation of the Skyrmion field configuration from the Yang-Mills gauge theories was proposed by Atiyah and Manton [27,28], which stimulated recent studies about mathematical connections of topological solitons in different dimensions [29,30,31,32,33,34] and [35,36,37,38,39,40,41]. Apart from such deep mathematical structures, Skyrmions now appear ubiquitously in many branches of theoretical physics [42] and are also observed in daily nanoscale magnetic experiments (see [43] and references therein).…”