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We show that type-II Weyl point formation in MnBi2-xSbxTe4 is more likelythan in MnBi2Te4 when x reaches 0.5, as the alloy case does not suffer from thesame degree of lattice parameter sensitivity as in MnBi2Te4. To furthersubstantiate the stability of type-II Weyl points in MnBi2-xSbxTe4, wedemonstrate that among the three conditions of establishing a type-II Weylpoint, two are robustly satisfied by the zone-folded dispersion of Bi and Te pzorbitals and spin-orbit coupling already available in MnBi2Te4, and that thecontrol over MnBi2-xSbxTe4 alloy composition provides a rational means tosatisfy the third condition. The stability of type-II Weyl points inMnBi1.5Sb0.5Te4 is thus intimately associated with orbital interactions,providing a concrete foundation for future efforts in band engineering and therational design of topological electronic structures.

Chemical requirements for stabilizing type-II Weyl points in MnBi2-xSbxTe4