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The surface Fermi arc states in $Z_2$ Weyl semimetals $A_3 Bi$ (A=Na, K, Rb)are studied by employing a continuum low-energy effective model. It is shownthat the surface Fermi arc states can be classified with respect to theud-parity symmetry. Because of the symmetry, the arcs come in mirror symmetricpairs. The effects of symmetry breaking terms on the structure of the Fermiarcs are also studied. Among other results, we find at least two qualitativelydifferent types of the surface Fermi arcs. The arcs of the first type linkdisconnected sheets of the bulk Fermi surface, while arcs of the second typelink different points of the same bulk Fermi surface sheet.

Surface Fermi arcs in $Z_2$ Weyl semimetals $A_3 Bi$ (A=Na, K, Rb)