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

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arxiv 2103.12730 v2 pith:MHTJZCAT submitted 2021-03-23 cond-mat.mtrl-sci

Yuanxi Wang This is my paper
classification cond-mat.mtrl-sci
keywords type-iiweylmnbi2-xsbxte4mnbi2te4pointsalloypointrational
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We show that type-II Weyl point formation in MnBi2-xSbxTe4 is more likely than in MnBi2Te4 when x reaches 0.5, as the alloy case does not suffer from the same degree of lattice parameter sensitivity as in MnBi2Te4. To further substantiate the stability of type-II Weyl points in MnBi2-xSbxTe4, we demonstrate that among the three conditions of establishing a type-II Weyl point, two are robustly satisfied by the zone-folded dispersion of Bi and Te pz orbitals and spin-orbit coupling already available in MnBi2Te4, and that the control over MnBi2-xSbxTe4 alloy composition provides a rational means to satisfy the third condition. The stability of type-II Weyl points in MnBi1.5Sb0.5Te4 is thus intimately associated with orbital interactions, providing a concrete foundation for future efforts in band engineering and the rational design of topological electronic structures.

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  1. Topological phase control in Mn1-xGexBi2Te4 via spin-orbit coupling and magnetic configuration engineering

    cond-mat.mtrl-sci 2025-05 conditional novelty 5.0 of 10

    DFT calculations predict Weyl semimetal phases in Mn1-xGexBi2Te4, including an antiferromagnetic configuration at 37.5% Ge where local Mn/Ge asymmetry induces Weyl points without remagnetization.

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