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The "Hydrogen atom" of magnetic Weyl semimetals, with the minimum number ofWeyl points, have received growing attention recently due to the possiblepresence of Weyl-related phenomena. Here, we report a nontrivial electronicstructure of the ferromagnetic alluaudite-type compoundK$_{2}$Mn$_3$(AsO$_{4}$)$_3$. It exhibits only a pair of Weyl pointsconstrained in the $z$-direction by the two-fold rotation symmetry, leading toextremely long Fermi arc surface states. In addition, the study of itslow-energy effective model results in the discovery of various topologicalsuperconducting states, such as the "hydrogen atom" of a Weyl superconductor.Our work provides a feasible platform to explore the intrinsic propertiesrelated to Weyl points, and the related device applications.

Magnetic Weyl semimetal in K$_{2}$Mn$_3$(AsO$_{4}$)$_3$ with the minimum number of Weyl points