“…However, there is another possibility of modulating the energy gap at the DP and reaching the TPT point through the partial replacement of Mn atoms with IV-group elements (Ge, Sn, Pb) [36][37][38][39][40][41][42] . In Refs [36][37][38] , it was shown that when Mn is replaced by Ge, Sn, or Pb atoms in the Mn 1−x A x Bi 2 Te 4 (A = Ge, Sn, Pb) compounds, the bulk band gap decreases with an increase in the concentration of the substituting atoms. The gap decreases to practically zero at substituting element concentrations of 40-50%, with a possible transition from the topological state to the Weyl semimetal (WSM) state.…”